错误：<identifier>预期的nm="Sam"；

Question

import java.util.*;

public abstract class Player {
    abstract String nm;
    public abstract void displayDetails();
}

class Booking extends Player {
nm = "Sam";           

    void displayDetails() {
        System.out.println("Name is:" + nm);
    }
}

//代码正在产生错误:所期望的标识符nm="sam"；

Answer 1

在Java中，应该只将表达式保存在块中。不能将nm = "Sam";保存在那里，请将其移动到实例初始化块中

import java.util.*;

public abstract class Player {
    String nm; // instance fields cant be declared as abstract
    public abstract void displayDetails();
}

class Booking extends Player {
    { // instance initialization block
      nm = "Sam";
    }

    void displayDetails() {
        System.out.println("Name is:" + name);
    }
}