Wrapper classes in Java

Wrapper classes are the classes provided by java programing these can be use as data type , because it is a wrapper class, so it wrapped. The datatype and some associated method in a class.

There are 9 wrapper classes in Java

• Short
• Interger
• Long
• Float
• Double
• Character
• Boolean
• Byte
• String

Integer

Method (Static)

• parseInt() :- Converts other types value into int datatype.
• valueOf() :- Converts other types value into integer type.

Long

Method (Static)

• parseLong() :- Converts other types value into long datatype.
• valueOf() :- Converts other types value into long type.

Character

Method (Static)

• parseChar() :- Converts other types value into char datatype.
• valueOf() :- Converts other types value into character type.

Float

Method (Static)

• parse() :- Converts other types value into float datatype.
• valueOf() :- Converts other types value into float type.

Boolean

Method (Static)

• parseBool() :- Converts other types value into bool datatype.
• valueOf() :- Converts other types value into boolean datatype.

Double

Method (Static)

• parseDouble() :- Converts other types value into double datatype.
• valueOf() :- Converts other types value into double datatype.

Byte

Method (Static)

• parseByte() :- Converts other types value into byte datatype.
• valueOf() :- Converts other types value into byte datatype.

Example

public class wra {
     
        public static void main(String[] args) { 
          Integer a = 25; 
          Double b = 25.36; 
          Character c = 's'; 
          System.out.println(a);
          System.out.println(b);
          System.out.println(c);
        }
    
}

Example

Let’s run the code

System:-  It is class defined within java.lang package that permots input  and output.

Out:- It is pre-defined static object of system class used for displaying message or value of variables.

Methods of out object

Print():-  This method displaying the message and value of variables in current line.

Escape sequence character are allowed

• \n = new line      
• \t = tab space
• + = string concatenation

Println():-  This is similar like print() but unlike print(), It creates new line after displaying the message or value.

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