错误：<identifier> expected nm =“Sam”; </identifier>

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);
    }
}

//代码产生错误：标识符期望nm =＆＃34; sam＆＃34 ;;

Answer 1

在Java中，您应该仅将表达式保留在块内。你不能在那里保留nm = "Sam";，在实例初始化块中移动它

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);
    }
}