Java int keyword

The Java int keyword is a primitive data type. It is used to declare variables. It can also be used with methods to return integer type values. It can hold a 32-bit signed two's complement integer.

Points to remember

The int contains minimum value of -2³¹ and a maximum value of 2³¹-1.
From Java 8, we can use int as an unsigned 32-bit integer, which has a minimum value of 0 and a maximum value of 2³²-1.
Its default value is 0.
Its default size is 4 byte.
It is generally used as a default data type for integral values.

Examples of Java byte keyword

Example 1

Let's see an example to use int data type with positive and negative value.

public class IntExample1
{
public static void main(String...k)
{
int num1=10;
int num2=-10;
System.out.println("num1: "+num1);
System.out.println("num2: "+num2);
}
}

Output:

num1: 10
num2: -10

Example 2

Let's see an example to check whether the int data type holds decimal value.

public class IntExample2
{
public static void main(String...k)
{
int num=10.5;
System.out.println("num: "+num);
}
}

Output:

error: incompatible types: possible lossy conversion from double to int

Example 3

Let's see an example to check whether the int data type holds float value.

public class IntExample3
{
public static void main(String...k)
{
int num=10f;
System.out.println("num: "+num);
}
}

Output:

error: incompatible types: possible lossy conversion from float to int

Example 4

Let's see an example to check whether the int data type holds char value.In such case, the compiler typecast the character implicitly into int type and returns the corresponding ASCII value.

public class IntExample4
{
public static void main(String...k)
{
int num='a';
System.out.println("num: "+num);
}
}

Output:

num: 97

Example 5

In this example, int data type holds the minimum and maximum value.

public class IntExample5
{
public static void main(String...k)
{
int min=-2147483648;
int max=2147483647;
System.out.println("min: "+min);
System.out.println("max: "+max);
}
}

Output:

min: -2147483648
max: 2147483647

Example 6

Let's create a method that returns an integer value.

public class IntExample6 {

	public int display(int num)
	{	
		return num;
	}
	
	public static void main(String[] args) {
		
		IntExample6 obj=new IntExample6();
		System.out.println(obj.display(10));
	}
	
}

Output:

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