//匿名内部类
public class Body{
interface A{
public void a();
}
interface Heart extends A{
public void print();
}
public static void main(String[] args){
new Heart(){
@Override
public void print() {
System.out.println("abc");
}
@Override
public void a() {
}
}.print();//用一次
}
}
//私有内部类
public class Body{
private static int blood = 2;
public static class Heart{
public void print(){
System.out.println(blood);
}
}
public static void main(String[] args){
Body.Heart heart = new Body.Heart();//
heart.print();
}
}
//成员内部类
public class Body {
private int blood = 0;
public class Heart{
private int heartBlood = 1;
public void print(){
System.out.println(blood);
System.out.println(heartBlood);
}
}
public static void main(String[] args){
Body.Heart heart = new Body().new Heart();//需要首先生成外部类
heart.print();
}
}