Java Change values of variables

To change the value of a variable in Java, you can simply assign a new value to it using the assignment operator =. For example, consider the following code:

int x = 10;
int y = 20;

x = y;  // x now has the value 20
y = 30;  // y now has the value 30

In this example, the value of x is changed from 10 to 20, and the value of y is changed from 20 to 30.

You can also use compound assignment operators to modify the value of a variable. These operators perform an operation and assignment in a single statement. For example, the following code increments the value of x by 5:

int x = 10;
x += 5;  // x now has the value 15

Other compound assignment operators include -=, *=, and /=.

It's also possible to change the value of a variable by calling a method that modifies its value. For example, consider the following code:

public class Main {
  public static void main(String[] args) {
    int x = 10;
    System.out.println(x);  // prints 10

    modify(x);
    System.out.println(x);  // prints 20
  }

  public static void modify(int x) {
    x = 20;
  }
}

In this example, the value of x is changed to 20 by the modify method. However, this change only affects the local variable x within the method. The value of the x variable in the main method is not changed.