java-抽象类遇到的问题
package com.test.jun;import com.test.jun.A.B;
abstract class A {
public static final String FLAG = "CHINA";
private String name = "june";
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public abstract void print();
public static class B extends A{
public void print() {
// TODO Auto-generated method stub
System.out.println("FLAG:" + FLAG);
System.out.println("name:" +super.getName());
}
}
}
public class AbstractTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub//抽象类不能初始化，所以new A 是错误的//A a=new A();
B b= new B();
b.print();
}
}-------------------------------------------------------------------------------------------- class B extends A{ public void print() {
// TODO Auto-generated method stub
System.out.println("FLAG:" + FLAG);
System.out.println("name:" +super.getName());
}
}
//抽象类无法初始化的，需要初始化就别用抽象类，用抽象类的子类，当时new B时候还是报错。错误为：No enclosing instance of type A is accessible. Must qualify the allocation with an enclosing instance of type A (e.g. x.new A() where x is an instance of A).然后一直纳闷，不是说抽象类不能初始化，可以用抽象类的子类吗？然后百度一下。答案是：我写的内部类是动态的，也就是开头以public class开头。而主程序是public static class main解决方法为： class B extends A{ 改为 public static class B extends A{public static class B extends A{ public void print() {
// TODO Auto-generated method stub
System.out.println("FLAG:" + FLAG);
System.out.println("name:" +super.getName());
}
}
谢谢楼主分享！楼主辛苦了！
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