changed.java~13~

提供了常用的JAVA技术的示例

package changed;

import javax.swing.UIManager;
import java.awt.*;

public class Changed {
  int changeInt(int x){
    x++;
    return x;
    System.out.print("a="+x);
  }
  void changeDouble(double y){
    y*=1.2;
    System.out.print("  b="+y);
  }
  void changeChar(char c){
    c='w';
    System.out.print("  c="+c);
  }
  void changeBoolean(boolean b){
    b=!b;
    System.out.print("  d="+b);
  }

 public static void main(String[] args) {
  int a=2;
  double b=5.3f;
  char c='e';
  boolean d=true;
  System.out.println("before change:");
  System.out.println("a="+a+"  b="+b+"  c="+c+"  d="+d);

  Changed cha=new Changed(); // 创建一个 change 类型的对象 cha

  System.out.println("after change:");
  cha.changeInt(3); System.out.print("a="+a);
  cha.changeDouble(b);
  cha.changeChar(c);
  cha.changeBoolean(d);


  }
}