Demonstrate lifetime of a variable : Variables « Language « Java Tutorial

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public class MainClass {
  public static void main(String args[]) {
    int x;

    for (x = 0; x < 3; x++) {
      int y = -1; // y is initialized each time block is entered
      System.out.println("y is: " + y); // this always prints -1
      y = 100;
      System.out.println("y is now: " + y);
    }
  }
}

y is: -1
y is now: 100
y is: -1
y is now: 100
y is: -1
y is now: 100