JAVA 数组学习

package JA;

public class Test01 {
    public static void main(String[] args) {
        int[] arr01=new int[10];
        String[] arr02=new String[5];
        User3[] arr03=new User3[3];
        for(int i=0;i

package JA;

public class Test01 {
    public static void main(String[] args) {
        int[] arr01=new int[10];
        String[] arr02=new String[5];
        String[] arr002={"aaa","bbb","ccc"};
        User3[] arr03=new User3[3];
        for(int i=0;i

package JA;

public class TestInterface {
    public static void main(String[] args) {
        Volant v=new Angle();//编译器视Angle为Volant类型
        v.fly();
        Honest h=new GoodMan();
        h.helpOther();

    }
}
//类是单继承 接口可以多继承
//interface C extends A,B{
//}
//飞行接口
interface Volant{
    int FLY_HEIGHT=1000;
    void fly();
}
//善良接口
interface Honest{
    void helpOther();
}
class Angle implements Volant,Honest{//实现类可以实现多个父接口

    @Override
    public void fly() {
        System.out.println("Angle.helpOther()");
    }

    @Override
    public void helpOther() {
        System.out.println("Angle.fly()");

    }
}
class GoodMan implements Honest{

    @Override
    public void helpOther() {
        System.out.println("GoodMan.helpOther()");
    }
}
class Birdman implements Volant{

    @Override
    public void fly() {
        System.out.println("Birdman.fly()");
    }
}

package JA;
//测试非静态内部类
public class TestInnerClass {
    //创建内部类对象
    public static void main(String[] args) {
        Outer.Inner inner=new Outer().new Inner();
        inner.show();
    }

}
class Outer{
    private int age=10;
    public void testOuter(){}
            class Inner{//内部类可以直接调用外部类对象 服务于外部类
        private int age=10;
                public void  show(){
                    int age=30;
                    System.out.println("外部类的成员变量age:"+Outer.this.age);
                    System.out.println("内部类的成员变量age"+this.age);
                    System.out.println("局部变量age:"+age);
            }
        }

}

package JA;
//测试匿名内部类
public class TestAnonymouseInnerClass {
    public static void test01(AA a){
        a.aa();
    }

    public static void main(String[] args) {
        TestAnonymouseInnerClass.test01((new AA(){
            @Override
            public void aa() {
                System.out.println("TestAnonymouse");
            }
        }));
    }

}
interface  AA{
    void aa();
}