Program:

class A{
public void method1(){
// Write code to call method2
}
public static void method2(){
// Write code to call method1
}
}

Program:

class A{
int i = 10;
static int j = 20;
public void method1(){
// Write code to use i and j
}
public static void method2(){
// Write code to use i and j
}
}