What is Method in Java With Best Example

Method in Java : – A Method is a Block of Code Which Only Runs When it is Called.

Note 1 : If a Method is void than that Method cannot return any value. Hence The Below Program Throws Error.

Method in Java

public class A {
	public static void main( String[] args) {
	
	}
	public void test () {
		return "mike" ;     // Error
	}
}

Example 2

public class A {
	public static void main( String[] args) {
	A a1 = new A();
	int x=a1.test();
	System.out.println(x);
	}

	public int test () {
		return 100;
	}
}

Output : 100

Note 2: If You Write Anything After return Keyword than That Line of Code Will Never Run, and Hence You Will Get Unreachable Code Error.

public class A {
	public static void main( String[] args) {
	A a1 = new A();
	int x=a1.test();
	System.out.println(x);
	}

	public int test () {
		return 100;
		System.out.println(10);  //Unreachable Code Error
	}
}

Example 2

public class A {
	public static void main( String[] args) {
	A a1 = new A();
	a1.test();
	System.out.println(10);
	}

	public void test () {
		return;   // return keyword optional when method is void
		
	}
}

You Also Learn –

• What is Abstract Class in Java
• What is Lambda Expression in Java 8
• What is Exception Handling in Java
• Types of Exception in Java
• What is inheritance in Java
• What is Final Keyword in Java
• What is Interface in Java
• What is Wrapper Class in Java
• Break Keyword in Java with Example

Output : 10

Example 3 Method in Java

public class A {
	public static void main( String[] args) {
	A a1 = new A();
	a1.test(10,'R',"Raj",true);
	}
	public void test (int x,char c,String s, boolean b) {
		System.out.println(x);
		System.out.println(c);
		System.out.println(s);
		System.out.println(b);
	}
}

Output :
10
R
Raj
true

Note 3 : Methods Breaks The Code into Module That Makes the Code Reusable.

Example 1

public class A {
	public static void main( String[] args) {
	A a1 = new A();
	a1.test(10,20,30,40,50);
	}
	public void test (int ...i) {
		System.out.println(i[0]);
		System.out.println(i[1]);
		System.out.println(i[2]);
		System.out.println(i[3]);
		System.out.println(i[4]);
	}
}

Output : 
10
20
30
40
50