Scope class demonstrates field and local variable scopes. - Java Language Basics

Java examples for Language Basics:Variable

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Description

Scope class demonstrates field and local variable scopes.

Demo Code

public class Main {
  // field that is accessible to all methods of this class
  static int x = 1;

  public static void main(String[] args) {
    int x = 5; // method's local variable x shadows field x

    System.out.printf("local x in main is %d%n", x);

    useLocalVariable(); // useLocalVariable has local x
    useField(); // useField uses class Scope's field x

    System.out.printf("%nlocal x in main is %d%n", x);
  }//w  w w .  ja  v a2  s .c om

  // create and initialize local variable x during each call
  public static void useLocalVariable() {
    int x = 25; // initialized each time useLocalVariable is called

    System.out.printf("%nlocal x on entering method useLocalVariable is %d%n",
        x);
    ++x; // modifies this method's local variable x
    System.out.printf("local x before exiting method useLocalVariable is %d%n",
        x);
  }

  // modify class Scope's field x during each call
  public static void useField() {
    System.out.printf("%nfield x on entering method useField is %d%n", x);
    x *= 10; // modifies class Scope's field x
    System.out.printf("field x before exiting method useField is %d%n", x);
  }
}

Result


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