自己做的demo---宣告可以在java世界开始自由了

package $interface;

public interface ILeaveHome {
    public abstract int a();
    public abstract int b();
    public abstract int c();
    public abstract int d();

}

package $interface;

public abstract class AbstractTools {
    private String abs01;//private的要设置访问器，外部的才可以访问
    private String abs02;
    public AbstractTools(String abs01,String abs02)
    {
        this.abs01=abs01;
        this.abs02=abs02;
    }
    
    public void tools1() {
        System.out.println("zzw abstract");
    }
    public abstract int tool2();
    
    
    public void setAbs01(String abs01)
    {
        this.abs01=abs01;
    }
    public String getAbs01()
    {
        return abs01;
    }
    public void setAbs02(String abs02)
    {
        this.abs02=abs02;
    }
    public String getAbs02()
    {
        return abs02;
    }
}

package $interface;

public class LeaveHomeImpl extends AbstractTools implements ILeaveHome{
    

    public LeaveHomeImpl(String a,String b){
        super(a, b);//调用父类的构造方法
        
        
    }
    public int  tool2(){
        int a=6666;        
        return a;
        
    }
    public int a(){
        int a=1;
        return a;
    }
    public int b(){
        int b=1;
        return b;
    }
    public int c(){
        int c=1;
        return c;
    }
    public int d(){
        int d=1;
        return d;
    }

    public static void main(String args[])
    {
        String z="z";
        String z6="z6";
        LeaveHomeImpl home=new LeaveHomeImpl(z,z6);
        System.out.println("home.a()="+home.a());
        System.out.println("home.b()="+home.b());
        System.out.println("home.c()="+home.c());
        System.out.println("home.d()="+home.d());    
        System.out.println("home.tool2()="+home.tool2());
        System.out.println("getAbs01="+home.getAbs01());
        System.out.println("getAbs02="+home.getAbs02());
        home.tools1();
        
    }
    

}

package $interface;

public class LeaveHomeTwice extends LeaveHomeImpl{
    String a;
    String b;

    public LeaveHomeTwice(){//第一种构造方式,
        
        super("a","b");//传值进去的时候会自动调用父类的有参数的构造方法
        
    }
    public LeaveHomeTwice(String a,String b){//带参数的构造方法，体现了构造方法的overload，构造方法的重载
        
        super(a,b);//改变了父类的值
        
    }
    //方法的override，方法的覆盖，对父类的覆盖
    public int  tool2(int a){
        
        int  zzw;
        zzw=a;
        return zzw;
        
    }
    
    public static void main(String args[])
    {
        int num=123;
        LeaveHomeTwice a=new LeaveHomeTwice();//对应第一种构造方式
        //LeaveHomeTwice a=new LeaveHomeTwice("zzwtwice","aiguotwice");//对应第二种构造方式
        System.out.println(a.a()+"	"+a.b()+"	"+a.c()+"	"+a.d()+"	"+a.tool2(num));
        
        
        a.tools1();
        System.out.println("getAbs01:"+a.getAbs01());
        System.out.println("getAbs02:"+a.getAbs02());
    
        
    }

}