public class A {
  int sex;
  int salary;

  void mw(int sex) {
    switch (sex) {
    case 0:
      System.out.println("男");
      break;
    case 1:
      System.out.println("女");
      break;
    default:
      System.out.println("妖");
    }
  }

  void employed(int salary) {
    if (salary == 0)
      System.out.println("i am jobless");
    else
      System.out.println("i have a job");
  }

  double income(int wage) {
    System.out.println("税前" + wage);
    return wage * 0.9;
  }

  public static void main(String[] args)
  {
     A wc = new A();
     A hj = new A();
     wc.sex=1;
     wc.salary=2;
     wc.mw(wc.sex);
     wc.employed(wc.salary);
     //wc.income(100);
     //double income=wc.income(100);
     //System.out.println("年薪"+wc.income(100));
     System.out.println("税后"+wc.income(100)); 
//这里我没有把wc.income(100)作为返回值赋给double income，
//怎么他还是会输出wage*0.9的值90，目前还是不太了解返回的运行机制，
//麻烦大家和我讲解一下，谢
  }
}