Go语言视频零基础入门到精通

jdnicky

class Payload {
   private int weight;
   public Payload(int wt) {
     weight = wt;
   }
   public Payload() {}
     public void setWeight(int w) {
        weight = w;
     }
    public String toString() {
      return Integer.toString(weight);
    }
}
public class TestPayload {
   static void changePayload(Payload p) {
     <插入代码>p = new Payload(420);
   }
   public static void main(String[] args) {
      Payload p = new Payload();
      p.setWeight(1024);
      changePayload(p);
      System.out.println("The value of p is " + p);
   }
}
假设运行后输出“The value of p is 420”，那么<插入代码>处应填入代码是：
  A. p.setWeight(420);
B. Payload.setWeight(420);
C. p = new Payload(420);
D. p = new Payload();
p.setWeight(420);
正确答案：A

Lysiki

p =new Payload(420);   其作用域在在函数内部  除了函数就销毁了
p.setWeight(420) 调用方法为其赋值