Data types in Java with examples

Java has two categories of data types,

• Primitive data type
• Non-Primitive data type

Data types in Java

• Primitive Data Type in Java
  • Boolean Type – boolean
  • char
  • byte
  • int
  • short
  • long
  • double
  • float

1. Boolean represents only single bit of data either true or false.

public class Solution { 
    public static void main(String args[]) { 
        boolean var = true;
        if (var == true) {
            System.out.println("Boolean value is true");
        }
    }
}

2. char represents a single 16-bit Unicode character.

public class Solution { 
    public static void main(String args[]) { 
        char var = 'A';
        System.out.println("char value is " +var);
    }
}

3. byte represents a single 8-bit complement integer. The byte values represent between -128 to 127.

public class Solution { 
    public static void main(String args[]) { 
        byte a = 5;
        byte b = -10;
        System.out.println("byte a value is " +a);
        System.out.println("byte b value is " +b);
    }
}

4. int represents 32-bit unsigned integer. The int values range between 0 to 2^32 – 1

public class Solution { 
    public static void main(String args[]) { 
        int var1 = 0;
        int var2 = 100;
        System.out.println("int var1 value is " +var1);
        System.out.println("int var2 value is " +var2);
    }
}

5. short represents is a 16-bit signed two’s complement integer.

public class Solution { 
    public static void main(String args[]) { 
        short var1 = 0;
        short var2 = 50;
        System.out.println("short var1 value is " +var1);
        System.out.println("short var2 value is " +var2);
    }
}

6. long represents is a 64-bit two’s complement integer.

public class Solution { 
    public static void main(String args[]) { 
        long var1 = 752;
        long var2 = 507589947;
        System.out.println("long var1 value is " +var1);
        System.out.println("long var2 value is " +var2);
    }
}

7. float represents is a single-precision 32-bit IEEE 754 floating point.

public class Solution { 
    public static void main(String args[]) { 
        float var1 = 12.495956f;
        float var2 = 5.265616f;
        System.out.println("float var1 value is " +var1);
        System.out.println("float var2 value is " +var2);
    }
}

8. double represents is a double-precision 64-bit IEEE 754 floating point.

public class Solution { 
    public static void main(String args[]) { 
        double var1 = 12.2;
        double var2 = 5.26;
        System.out.println("double var1 value is " +var1);
        System.out.println("double var2 value is " +var2);
    }
}

Non-Primitive Data Type in Java

• String – Strings are defined as an array of characters in java.

public class Solution { 
    public static void main(String args[]) {
        String var = "World";
        System.out.println("Hello " + var);
    }
}

Output: Hello World

• Arrays – An arrays are a group of like-typed variables that are referred to by a common name in java.

public class Solution { 
    public static void main(String args[]) { 
        int[] Array = {4,5,8,9,7};

        System.out.println("Array first element is " + Array[0]);
        System.out.println("Array last element is "+ Array[4]);

    }
}

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