Java Tutorial : Java String Concatenation

Click here to watch in Youtube :
https://www.youtube.com/watch?v=Fc0C-ZrmSTE&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String Concatenation 

ConcatenationDemo1.java

public class ConcatenationDemo1
{

    public static void main(String[] args)
    {
        /*
         * String concatenation operator produces a new
         * string by appending the second operand onto the
         * end of the first operand.
         */
        String string1 = "Hello" + " World";
        System.out.println(string1);// Hello World

        /*
         * The string concatenation operator can concat not
         * only string but primitive values also.
         */
        String string2 = 50 + 30 + "Hello" + 40 + 40;
        System.out.println(string2);// 80Sachin4040

    }
}

Output

Hello World
80Hello4040

ConcatenationDemo2.java

public class ConcatenationDemo2
{

    public static void main(String[] args)
    {
        String s1 = "Sachin ";  
        String s2 = "Tendulkar";
        String s3 = s1.concat(s2);
        System.out.println(s3);// Sachin Tendulkar

    }

}

Output

Sachin Tendulkar

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_Concatination_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_Concatination_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_Concatination_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String Comparison

Click here to watch in Youtube :
https://www.youtube.com/watch?v=IYWyfrivZYg&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String Comparison 

CompareByEqualsDemo.java

public class CompareByEqualsDemo
{

    public static void main(String[] args)
    {
        String s1 = "Peter";
        String s2 = "Peter";
        String s3 = new String("Peter");
        String s4 = "Dave";
        System.out.println(s1.equals(s2));// true
        System.out.println(s1.equals(s3));// true
        System.out.println(s1.equals(s4));// false
    }

}

Output

true
true
false

CompareByEqualsIgnoreCaseDemo.java

public class CompareByEqualsIgnoreCaseDemo
{

    public static void main(String[] args)
    {
        String s1 = "peter";
        String s2 = "PETER";

        System.out.println(s1.equals(s2));// false
        System.out.println(s1.equalsIgnoreCase(s2));// true

    }

}

Output

false
true

CompareByDemo.java

public class CompareByDemo
{

    public static void main(String[] args)
    {
        String s1 = "Peter";
        String s2 = "Peter";
        String s3 = new String("Peter");

        /*
         * true (because both refer to same instance)
         */
        System.out.println(s1 == s2);

        /*
         * false(because s3 refers to instance created in
         * nonpool)
         */
        System.out.println(s1 == s3);

    }

}

Output

true
false

CompareByCompareToDemo.java

public class CompareByCompareToDemo
{

    public static void main(String[] args)
    {
        String s1 = "Sachin";
        String s2 = "Sachin";
        String s3 = "Ratan";
        
        System.out.println(s1.compareTo(s2));// 0

        /*
         * 1(because s1>s3)
         */
        System.out.println(s1.compareTo(s3));
        /*
         * -1(because s3 < s1 )
         */
        System.out.println(s3.compareTo(s1));

    }

}

Output

0
1
-1

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_Comparison_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_Comparison_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_Comparison_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [codePointCount(int beginIndex,int endIndex) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=pb2rT6r69m4&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [codePointCount(int beginIndex,int endIndex) method] 

CodePointCountDemo.java

/*
 * public int codePointCount(int beginIndex, int
 *                                      endIndex)
 * 
 * Parameters: 
 * ---------- 
 * beginIndex - the index to the first char of the text
 * range. 
 * 
 * endIndex - the index after the last char of
 * the text range.
 * 
 * Returns: 
 * ------- 
 * the number of Unicode code points in the specified
 * text range
 * 
 * Throws: 
 * ------ 
 * IndexOutOfBoundsException - if the beginIndex is
 * negative, or endIndex is larger than the length of
 * this String, or beginIndex is larger than endIndex.
 */

public class CodePointCountDemo
{

    public static void main(String[] args)
    {
        String str = "JAVA programming language";
        System.out.println("String = " + str);

        int retval = str.codePointCount(1, 8);

        System.out.println("Codepoint count = " + retval);

    }

}

Output

String = JAVA programming language
Codepoint count = 7

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_codePointCount_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_codePointCount_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_codePointCount_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [codePointBefore(int index) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=LF7lxdGbKis&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [codePointBefore(int index) method]

CodePointBeforeDemo.java

/*
 * public int codePointBefore(int index)
 * 
 * Parameters: 
 * ---------- 
 * index - the index following the code point that
 * should be returned
 * 
 * Returns: 
 * ------- 
 * the Unicode code point value before the given index.
 * 
 * Throws: 
 * ------ 
 * IndexOutOfBoundsException - if the index argument is
 * less than 1 or greater than the length of this
 * string.
 */
public class CodePointBeforeDemo
{

    public static void main(String[] args)
    {
        String str = "JAVA";
        System.out.println("String = " + str);

        // codepoint before index 1 i.e J
        int retval = str.codePointBefore(1);

        // prints character before index1 in string
        System.out.println("Character(unicode point) = " + retval);

    }

}

Output

String = JAVA
Character(unicode point) = 74

Refer: 
https://en.wikipedia.org/wiki/List_of_Unicode_characters
Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_codePointBefore_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_codePointBefore_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_codePointBefore_App/?at=master
See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [codePointAt(int index) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=og707Rf1eD8&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [codePointAt(int index) method] 

CodePointAtDemo.java

/*
 * public int codePointAt(int index)
 * 
 * Parameters: 
 * ---------- 
 * index - the index to the char values
 * 
 * Returns: 
 * ------- 
 * the code point value of the character at the index
 * 
 * Throws: 
 * ------ 
 * IndexOutOfBoundsException - if the index argument is
 * negative or not less than the length of this string.
 */

public class CodePointAtDemo
{

    public static void main(String[] args)
    {
        String str = "JAVA";
        System.out.println("String = " + str);

        int retval = str.codePointAt(1);
        System.out.println("Character(unicode point) = " + retval);
        
    }

}

Output

String = JAVA
Character(unicode point) = 65

Refer: 
https://en.wikipedia.org/wiki/List_of_Unicode_characters
C lick the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_codePointAt_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_codePointAt_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_codePointAt_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [copyValueOf(char[] data,int offset,int count) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=lrButyBBUCs&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [copyValueOf(char[] data,int offset,int count) method] 

CopyValueOfDemo.java

/*
 * public static String copyValueOf(char[] data, 
 *                           int offset, int count) 
 * 
 * Equivalent to valueOf(char[], int, int).
 * 
 * Parameters: 
 * ---------- 
 * data - the character array. 
 * 
 * offset - initial offset of the subarray. 
 * 
 * count - length of the subarray.
 * 
 * Returns: 
 * ------- 
 * a String that contains the characters of the
 * specified subarray of the character array.
 * 
 * Throws: 
 * ------ 
 * IndexOutOfBoundsException - if offset is negative, or
 * count is negative, or offset+count is larger than
 * data.length.
 */

public class CopyValueOfDemo
{

    public static void main(String[] args)
    {
        char[] charArray =
        { 'H', 'i', ' ', 'W', 'e', 'l', 'c', 'o', 'm', 'e' };

        String str = String.copyValueOf(charArray, 6, 3);
        System.out.println(str);

    }

}

Output

com

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_copyValueOf_Offset_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_copyValueOf_Offset_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_copyValueOf_Offset_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [copyValueOf(char[] data) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=09ZMmsqvvaw&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [copyValueOf(char[] data) method] 

CopyValueOfDemo.java

/*
 * public static String copyValueOf(char[] data)
 * 
 * Equivalent to valueOf(char[]).
 * 
 * Parameters: 
 * ---------- 
 * data - the character array.
 * 
 * Returns: 
 * -------  
 * a String that contains the
 * characters of the character array.
 */
public class CopyValueOfDemo
{

    public static void main(String[] args)
    {
        char[] charArray =
        { 'H', 'i' };

        String str = String.copyValueOf(charArray);
        System.out.println(str);

    }

}

Output

Hi

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_copyValueOf_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_copyValueOf_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_copyValueOf_App/?at=master
See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [contentEquals(StringBuffer sb) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=4t2JhuF_ER8&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [contentEquals(StringBuffer sb) method] 

ContentEqualsDemo.java

/*
 * public boolean contentEquals(StringBuffer sb)
 * 
 * Parameters: 
 * ---------- 
 * sb - The StringBuffer to compare this String against
 * 
 * Returns: 
 * ------- 
 * true if this String represents the same sequence of
 * characters as the specified StringBuffer, false
 * otherwise
 */
public class ContentEqualsDemo
{

    public static void main(String[] args)
    {
        String str = "Welcome Peter";
        StringBuffer sb1 = new StringBuffer("Welcome Peter");
        StringBuffer sb2 = new StringBuffer("Hello");

        boolean result = str.contentEquals(sb1);
        System.out.println("str.contentEquals(sb1) = " + result);
        result = str.contentEquals(sb2);
        System.out.println("str.contentEquals(sb2) = " + result);

    }

}

Output

str.contentEquals(sb1) = true
str.contentEquals(sb2) = false

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_contentEquals_sb_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_contentEquals_sb_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/12836b6e32056aa84ee5263036ba2429cc0bd845/BasicJava/StringDemo_contentEquals_sb_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [contentEquals(CharSequence cs) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=NMG2oFYXbGc&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [contentEquals(CharSequence cs) method] 

ContentEqualsDemo.java

/*
 * public boolean contentEquals(CharSequence cs)
 * 
 * Parameters: 
 * ---------- 
 * cs - The sequence to compare this String against
 * 
 * Returns: 
 * ------- 
 * true if this String represents the same sequence of
 * char values as the specified sequence, false
 * otherwise
 */

public class ContentEqualsDemo
{

    public static void main(String[] args)
    {
        String str1 = "Welcome Peter";
        String str2 = "Hi";
        String str3 = "Welcome Peter";

        boolean result = str1.contentEquals(str2);
        System.out.println("\"Welcome Peter\".contentEquals(\"Hi\") = " + result);
        result = str1.contentEquals(str3);
        System.out.println("\"Welcome Peter\".contentEquals(\"Welcome Peter\") = " + result);

    }

}

Output

"Welcome Peter".contentEquals("Hi") = false
"Welcome Peter".contentEquals("Welcome Peter") = true

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_contentEquals_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_contentEquals_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/89dfdef018d2970576505c9f498b5e4f28628c35/BasicJava/StringDemo_contentEquals_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [valueOf methods]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=DfX43K-iD1I&list=UUhwKlOVR041tngjerWxVccw

 Click the below Image to Enlarge

Java Tutorial : Java String [valueOf methods] 

ValueOfDemo.java

public class ValueOfDemo
{

    public static void main(String[] args)
    {
        int intValue=30;  
        String str=String.valueOf(intValue);
        System.out.println(str);
        
        double doubleValue=30;  
        str=String.valueOf(doubleValue);
        System.out.println(str);
        
        char[] charArray ={'H','i'};;
        str=String.valueOf(charArray);
        System.out.println(str);
        
        boolean value = true;
        str=String.valueOf(value);
        System.out.println(str);        
    }

}

Output

30
30.0
Hi
true

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_valueOf_methods_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_valueOf_methods_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/89dfdef018d2970576505c9f498b5e4f28628c35/BasicJava/StringDemo_valueOf_methods_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [toCharArray() method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=WSC-AXsho9E&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [toCharArray() method] 

ToCharArrayDemo.java

/*
 * public char[] toCharArray()
 * 
 * 
 * Returns: 
 * --------
 * 
 * a newly allocated character array whose length is the
 * length of this string and whose contents are
 * initialized to contain the character sequence
 * represented by this string.
 */
public class ToCharArrayDemo
{

    public static void main(String[] args)
    {
        String str = "Welcome";
        char[] charArray = str.toCharArray();
        for (char c : charArray)
        {
            System.out.println(c);
        }
    }

}

Output

W
e
l
c
o
m
e

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_toCharArray_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_toCharArray_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/89dfdef018d2970576505c9f498b5e4f28628c35/BasicJava/StringDemo_toCharArray_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [join method-Iterable]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=g42wdErMKXs&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [join method-Iterable] 

JoinDemo.java

import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

/*
 * public static String join(CharSequence delimiter,
 *              Iterable<? extends CharSequence> elements)
 * 
 * Parameters: 
 * ----------- 
 * delimiter - a sequence of characters that is used
 * to separate each of the elements in the resulting
 * String 
 * 
 * elements - an Iterable that will have its
 * elements joined together.
 * 
 * Returns: 
 * -------- 
 * a new String that is composed from the elements
 * argument
 * 
 * Throws: 
 * ------- 
 * NullPointerException - If delimiter or elements
 * is null
 */

public class JoinDemo
{
    public static void main(String[] args)
    {
        List<String> listOfStrings = new LinkedList<>();
        listOfStrings.add("Java");
        listOfStrings.add("is");
        listOfStrings.add("cool");

        // message returned is: "Java|is|cool"
        String message = String.join("|", listOfStrings);
        System.out.println(message);

        Set<String> setOfStrings = new LinkedHashSet<>();
        setOfStrings.add("Java");
        setOfStrings.add("is");
        setOfStrings.add("very");
        setOfStrings.add("cool");

        // message returned is: "Java-is-very-cool"
        message = String.join("-", setOfStrings);
        System.out.println(message);
    }

}

Output

Java|is|cool
Java-is-very-cool

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_Join_Iterable_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_Join_Iterable_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/89dfdef018d2970576505c9f498b5e4f28628c35/BasicJava/StringDemo_Join_Iterable_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [join(CharSequence delimiter,CharSequence... elements) method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=vjUPeAaUV1k&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [join(CharSequence delimiter,CharSequence... elements) method] 

JoinDemo.java

/*
 * public static String join(CharSequence delimiter,
 *                              CharSequence... elements)
 * 
 * Parameters: 
 * ----------- 
 * delimiter - the delimiter that separates each element
 * 
 * elements - the elements to join together.
 * 
 * Returns: 
 * -------- 
 * a new String that is composed of the elements
 * separated by the delimiter.
 * 
 * Throws: 
 * ------- 
 * NullPointerException - If delimiter or elements is
 * null
 */

public class JoinDemo
{
    public static void main(String[] args)
    {
        String str1 = "welcome";
        String str2 = "to";
        String str3 = "India";

        String joinString = String.join("_", str1, str2, str3);
        System.out.println("JoinString = " + joinString);

    }

}

Output

JoinString = welcome_to_India

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_join_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_join_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/89dfdef018d2970576505c9f498b5e4f28628c35/BasicJava/StringDemo_join_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Java Tutorial : Java String [intern() method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=vx2iB6ahAYE&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial : Java String [intern() method] 

InternDemo.java

/*
 * public String intern()
 *  
 * Returns: 
 * -------
 * a string that has the same contents as 
 * this string, but is guaranteed to be 
 * from a pool of unique strings.
 */
public class InternDemo
{
    public static void main(String[] args)
    {
        String s1 = new String("hello");
        String s2 = "hello";

        /*
         * returns string from pool, now it will be same as
         * s2
         */

        String s3 = s1.intern();
        System.out.println(s3);

        /*
         * false because reference is different
         */
        System.out.println(s1 == s2);

        /*
         * true because reference is same
         */
        System.out.println(s2 == s3);

    }
}

Output

hello
false
true

Click the below link to download the code:
https://sites.google.com/site/javaee4321/java/StringDemo_intern_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/StringDemo_intern_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/89dfdef018d2970576505c9f498b5e4f28628c35/BasicJava/StringDemo_intern_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial