change.java

提供了常用的JAVA技术的示例

package change;

public class Change {
  void changeInt(int x){
    x++;
  }
  void changeDouble(double y){
    y*=1.2;
  }
  void changeChar(char c){
    c='w';
  }
  void changeBoolean(boolean b){
    b=!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);

  Change cha=new Change(); // 创建一个 change 类型的对象 cha
  cha.changeInt(a);
  cha.changeDouble(b);
  cha.changeChar(c);
  cha.changeBoolean(d);
  System.out.println("after change:");
  System.out.println("a="+a+"  b="+b+"  c="+c+"  d="+d);

   }
}