String Handling Archives

Java String Tutorial

String Class is a widely used class in java. String Class represents a bunch of characters and is similar to a character array. String class has almost a dozen constructors and can be used to creat

Difference String StringBuffer and StringBuilder

We will see the differences between String, StringBuffer and StringBuilder. The main differences are related to thread safe nature and performance. Difference String StringBuffer and StringBuilder

String.format java example

In this post we will see String.format java examples. Format method in String returns a formatted string using the specified format string and arguments.

public static String format(String format,Object... args)

1	public static String format(String format,Object... args)

Params : f

String trim example

String trim method is used to remove the leading and trailing white spaces in a String.

public String trim()

1	public String trim()

String trim method example

package com.kscodes.sampleproject;

public class StringTrimExample {

	
	public static void main(String[] args) {
	
		String testStr1 = "    Make me Slim trim    ";
		
		System.out.println("Original String ::" + testStr1);
		System.out.println("Original String length ::" + testStr1.length());
		
		System.out.println("----------------------------------");
		
		System.out.println("After trimming ::"+ testStr1.trim());		
		System.out.println("After trimming String length ::"+ testStr1.trim().length());
		
	}

}

package com.kscodes.sampleproject;

public class StringTrimExample {

public static void main(String[] args) {

String testStr1 = " Make me Slim trim ";

System.out.println("Original String ::" + testStr1);

System.out.println("Original String length ::" + testStr1.length());

System.out.println("----------------------------------");

System.out.println("After trimming ::"+ testStr1.trim());

System.out.println("After trimming String length ::"+ testStr1.trim().length());

}

Output [crayon-6

String concat example

Concat method of String in java is used to add a new String at the end of the original String.

public String concat(String str)

1	public String concat(String str)

String concat example

package com.kscodes.sampleproject;

public class StringConcatExample {

	public static void main(String[] args) {

		String testStr1 = "This is test String";
		String testStr2 = " Used for Concat Example.";
		
		System.out.println("After 2 String concat::" + testStr1.concat(testStr2));
		
		System.out.println("Adding 1 more to concat::" + testStr1.concat(testStr2).concat("Added more to this String"));
		
	}

}

package com.kscodes.sampleproject;

public class StringConcatExample {

public static void main(String[] args) {

String testStr1 = "This is test String";

String testStr2 = " Used for Concat Example.";

System.out.println("After 2 String concat::" + testStr1.concat(testStr2));

System.out.println("Adding 1 more to concat::" + testStr1.concat(testStr2).concat("Added more to this String"));

}

Output [crayon

String endsWith example

String endsWith is used to check if a String ends with the given suffix.

public boolean endsWith(String suffix)

1	public boolean endsWith(String suffix)

endsWith() method returns a boolean value based on the suffix passed String endsWith exampl

String startsWith example

String startsWith method is used to check if a String starts with a specified substring. Startswith method has 2 variations and we will see both these.

public boolean startsWith(String prefix)
public boolean startsWith(String prefix,int toffset)

1 2	public boolean startsWith(String prefix) public boolean startsWith(String prefix,int toffset)

[crayon-6701

String replace methods example

String replace methods are used to replace a part of string with a new string. We have 4 variations for replace in String

String replace(char oldChar, char newChar)
String replace(CharSequence target, CharSequence replacement)
String replaceAll(String regex, String replacement)
String replaceFirst(String regex, String replacement)

String replace(char oldChar, char newChar)

String replace(CharSequence target, CharSequence replacement)

String replaceAll(String regex, String replacement)

String replaceFirst(String regex, String replacement)

String replace(char oldChar, char newChar) returns

String lastIndexOf example

String lastIndexOf returns the index of the last occurrence of the given String for specified conditions searching backward. String lastIndexOf method can be used with multiple types of parameters

String indexOf example

String indexOf returns the index of the given String for specified conditions. String indexOf method can be used with multiple types of parameters as shown below

public int indexOf(int ch)
public int indexOf(int ch,int fromIndex)
public int indexOf(String str)
public int indexOf(String str,int fromIndex)

public int indexOf(int ch)

public int indexOf(int ch,int fromIndex)

public int indexOf(String str)

public int indexOf(String str,int fromIndex)