Java StringBuilder append() method

The append() method of Java StringBuilder class is used to append the string value to the current sequence. There are various overloaded append() methods available in StringBuilder class. These methods are differentiated on the basis of their parameters.

Syntax:

Let's see the different syntax of StringBuilder append() method:

public StringBuilder append(boolean b)
public StringBuilder append(char c)
public StringBuilder append(char[] str)
public StringBuilder append(char[] str, int offset, int len)
public StringBuilder append(CharSequence cs)
public StringBuilder append(CharSequence cs, int start, int end)
public StringBuilder append(double d)
public StringBuilder append(float f)
public StringBuilder append(int i)
public StringBuilder append(long lng)
public StringBuilder append(Object obj)
public StringBuilder append(String str)
public StringBuilder append(StringBuffer sb)
public StringBuilder appendCodePoint(int codePoint)

Parameter:

DataType	Parameter	Description
boolean	b	A boolean value which is to be appended.
char	c	A char value which is to be appended.
char	str	These are the characters which are to be appended.
int	offset	The index of the first char to append.
int	len	The number of characters to append.
CharSequence	cs	The character sequence that is to append.
int	start	This is the starting index of subsequence which is to be appended.
int	end	This is the end index of the subsequence which is to be appended.
double	d	A double value which is to be appended.
float	f	A float value which is to be appended.
int	i	An int value which is to be appended.
long	lng	A long value which is to be appended.
Object	Obj	An Object value which is to be appended.
String	str	A string value which is to be appended.
StringBuffer	sb	A StringBuffer which is appended.
int	codePoint	An int value of Unicode code point.

Returns:

Method	Returns
append(boolean b)	It returns a reference to this object.
append(char c)	It returns a reference to this object.
append(char[] str)	It returns a reference to this object.
append(char[] str, int offset, int len)	It returns a reference to this object.
append(CharSequence cs)	It returns a reference to this Appendable.
append(CharSequence cs, int start, int end)	It returns a reference to this object.
append(double d)	It returns a reference to this object.
append(float f)	It returns a reference to this object.
append(int i)	It returns a reference to this object.
append(long lng)	It returns a reference to this object.
append(Object obj)	It returns a reference to this object.
append(String str)	It returns a reference to this object.
append(StringBuffer sb)	It returns a reference to this object.
appendCodePoint(int codePoint)	It returns a reference to this object.

Exceptions:

Method	Exception
append(boolean b)	NA
append(char c)	NA
append(char[] str)	NA
append(char[] str, int offset, int len)	IndexOutOfBoundsException
append(CharSequence s)	NA
append(CharSequence s, int start, int end)	IndexOutOfBoundsException
append(double d)	NA
append(float f)	NA
append(int i)	NA
append(long lng)	NA
append(Object obj)	NA
append(String str)	NA
append(StringBuffer sb)	NA
appendCodePoint(int codePoint)	NA

Compatibility Version:

Java 1.5 and above

Example of Java StringBuilder append(boolean b) method

public class StringBuilderAppendExample1 {
	public static void main(String[] args) {
	      StringBuilder sb1 = new StringBuilder("value1 ");
	      System.out.println("builderObject :"+sb1);
	   // appending boolean argument
	      sb1.append(true);
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb1);

	      StringBuilder sb2 = new StringBuilder("value2 ");
	      System.out.println("new builderObject :" + sb2);
	      
	      // appending boolean argument    
	      sb2.append(false);
	      
	      // print the string Builder after appending
	      System.out.println("after append = " + sb2);
	}

}

Test it Now

Output:

builderObject :value1 
after append = value1 true
new builderObject :value2 
after append = value2 false

Example of Java StringBuilder append(char c) method

public class StringBuilderAppendExample2 {
	public static void main(String[] args) {
	      StringBuilder sb1 = new StringBuilder("value1 ");
	      System.out.println("builderObject :"+sb1);
	   // appending char argument
	      sb1.append('A');
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb1);

	      StringBuilder sb2 = new StringBuilder("value2 ");
	      System.out.println("new builderObject :" + sb2);
	      
	      // appending char argument    
	      sb2.append('#');
	      
	      // print the string Builder after appending
	      System.out.println("after append = " + sb2);
	  }
}

Test it Now

Output:

builderObject :value1 
after append = value1 A
new builderObject :value2 
after append = value2 #

Example of Java StringBuilder append(char[] str) method

public class StringBuilderAppendExample3 {
	public static void main(String[] args) {
	      StringBuilder sb1 = new StringBuilder("string ");
	      System.out.println("builderObject :"+sb1);
	      char[] str = {'a','b','c'};
	   // appending char array argument
	      sb1.append(str);
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb1);

	  }
}

Test it Now

Output:

builderObject :string 
after append = string abc

Example of Java StringBuilder append(char[] str, int offset, int len) method

public class StringBuilderAppendExample4 {
	public static void main(String[] args){
	      StringBuilder sb1 = new StringBuilder("string builder ");
	      System.out.println("builderObject :"+sb1);
	      char[] str = {'a','b','c','d','e','f','g'};
	   // appending char array argument
	      sb1.append(str,1,5);
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb1);
	}
}

Test it Now

Output:

builderObject :string builder 
after append = string builder bcdef

Example of Java StringBuilder append(CharSequence cs) method

public class StringBuilderAppendExample5 {
	public static void main(String[] args) {
	      StringBuilder sb = new StringBuilder("string builder ");
	      System.out.println("builderObject :"+sb);
	      
	      CharSequence cs = "char sequence";
	   // appending charsequence argument
	      sb.append(cs);
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builderObject :string builder 
after append = string builder char sequence

Example of Java StringBuilder append(CharSequence cs, int start, int end) method

public class StringBuilderAppendExample6 {
	public static void main(String[] args) {
	      StringBuilder sb = new StringBuilder("string builder ");
	      System.out.println("builderObject :"+sb);
	      
	      CharSequence cs = "charsequence";
	   // appending charsequence argument start at index 4 and end at 8(exclusive)
	      sb.append(cs,4,8);
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builderObject :string builder 
after append = string builder sequ

Example of Java StringBuilder append(double d) method

public class StringBuilderAppendExample7 {
	public static void main(String[] args) {
	      StringBuilder sb = new StringBuilder("string builder ");
	      System.out.println("builder :"+sb);
	      
	      // appending double argument
	      sb.append(12.6543210123456789d);
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builder :string builder 
after append = string builder 12.65432101234568

Example of Java StringBuilder append(float f) method

public class StringBuilderAppendExample8 {
	public static void main(String[] args) {
                   StringBuilder sb = new StringBuilder("string builder ");
	      System.out.println("builder :"+sb);
	      
	      // appending float argument
	      sb.append(10.65f);
	      // print the StringBuilder after appending
	      System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builder :string builder 
after append = string builder 10.65

Example of Java StringBuilder append(int i) method

public class StringBuilderAppendExample9 {
	public static void main(String[] args) {
		 StringBuilder sb = new StringBuilder("append int ");
		 System.out.println("builder :"+sb);
		      
		 // appending int argument
		 sb.append(100);
		 // print the StringBuilder after appending
		 System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builder :append int 
after append = append int 100

Example of Java StringBuilder append(long lng) method

public class StringBuilderAppendExample10 {
	public static void main(String[] args) {
	    StringBuilder sb = new StringBuilder("append long ");
	    System.out.println("builder :"+sb);
	      
	    // appending long argument
	    sb.append(9223372036854775807l);
	    // print the StringBuilder after appending
	    System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builder :append long 
after append = append long 9223372036854775807

Example of Java StringBuilder append(Object obj) method

public class StringBuilderAppendExample11 {
	public static void main(String[] args) {
	    StringBuilder sb = new StringBuilder("append object ");
	    System.out.println("builder :"+sb);
	    Object obj ="objectValue";
	    // appending object argument
	    sb.append(obj);
	    // print the StringBuilder after appending
	    System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builder :append object 
after append = append object objectValue

Example of Java StringBuilder append(String str) method

public class StringBuilderAppendExample12 {
	public static void main(String[] args) {
	    StringBuilder sb = new StringBuilder("append string ");
	    System.out.println("builder :"+sb);
	    String str ="my string";
	    // appending string argument
	    sb.append(str);
	    // print the StringBuilder after appending
	    System.out.println("after append = " + sb);
	}
}

Test it Now

Output:

builder :append string 
after append = append string my string

Example of Java StringBuilder append(StringBuffer sb) method

public class StringBuilderAppendExample13 {
	public static void main(String[] args) {
	    StringBuilder stringBuilder = new StringBuilder("append stringBuffer ");
	    System.out.println("builder :"+stringBuilder);
	    
	    StringBuffer sb =new StringBuffer("bufferValue");
	    // appending string buffer argument
	    stringBuilder.append(sb);
	    // print the StringBuilder after appending
	    System.out.println("after append = " + stringBuilder);
	}
}

Test it Now

Output:

builder :append stringBuffer 
after append = append stringBuffer bufferValue

Example of Java StringBuilder appendCodePoint(int codePoint) method

public class StringBuilderAppendExample14 {
	public static void main(String[] args) {
		StringBuilder sb1 = new StringBuilder("append codePoint1 ");
	    
	    StringBuilder sb2 = new StringBuilder("append codePoint2 ");
	    
	    // appending codePoint argument
	    sb1.appendCodePoint(64);
	   
	    sb2.appendCodePoint(65);
	    // print the StringBuilder after appending
	    System.out.println("after append :\n" +sb1+"\n"+sb2);
	}
}

Test it Now

Output:

after append :
append codePoint1 @
append codePoint2 A

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Java StringBuilder append() method

Syntax:

Parameter:

Returns:

Exceptions:

Compatibility Version:

Example of Java StringBuilder append(boolean b) method

Example of Java StringBuilder append(char c) method

Example of Java StringBuilder append(char[] str) method

Example of Java StringBuilder append(char[] str, int offset, int len) method

Example of Java StringBuilder append(CharSequence cs) method

Example of Java StringBuilder append(CharSequence cs, int start, int end) method

Example of Java StringBuilder append(double d) method

Example of Java StringBuilder append(float f) method

Example of Java StringBuilder append(int i) method

Example of Java StringBuilder append(long lng) method

Example of Java StringBuilder append(Object obj) method

Example of Java StringBuilder append(String str) method

Example of Java StringBuilder append(StringBuffer sb) method

Example of Java StringBuilder appendCodePoint(int codePoint) method

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