写到这里之后应该怎么办

import java.util.Scanner;
public class Main {
 public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int x = in.nextInt();
int y = in.nextInt();
int z = in.nextInt();
MyVector a = new MyVector();
MyVector b = new MyVector(x, y, z);
MyVector xx = a.add(b);
xx.display();
MyVector yy = a.sub(b);
yy.display();
MyVector zz = a.cross(b);
zz.display();
int dd = a.dot(b);
System.out.println(dd);
in.close();
 }
}
class MyVector{
    private static int x;
    private static int y;
    private static int z;
    public MyVector(int x, int y, int z) {
        this.x=x;
        this.y=y;
        this.z=z;    }
    public MyVector() {
        x=0;
        y=0;
        z=0;    
        }

    public MyVector add(MyVector b) {
        int xx=this.x+MyVector.x;
        i
    }

    

}

如有帮助，望采纳

import java.util.Scanner;

 class Main {
    public static void main(String[] args) {
        System.out.println(0-1);
        Scanner in = new Scanner(System.in);
        int x = in.nextInt();
        int y = in.nextInt();
        int z = in.nextInt();
        
        MyVector b = new MyVector(x, y, z);
        MyVector a1= new MyVector();
        MyVector xx = a1.add(b);
        System.out.print("jia");
        xx.display();
        
        
        MyVector a2= new MyVector();
        MyVector yy = a2.sub(b);
        System.out.print("sub");
        yy.display();
    
        MyVector a3= new MyVector();
        MyVector zz = a3.cross(b);
        System.out.print("cross");
        zz.display();
        
        MyVector a4= new MyVector();
        int dd = a4.dot(b);
        System.out.println(dd);
        in.close();
    }
}
class MyVector{
    private  int x;
    private  int y;
    private  int z;
    
    public MyVector(int x, int y, int z) {
        this.x=x;
        this.y=y;
        this.z=z;    }
    
    public MyVector() {
        this.x=0;
        this.y=0;
        this.z=0;
    }
    
    public MyVector add(MyVector b) {
         this.x+=b.x ;
         this.y+=b.y ;
         this.z+=b.z ;
        return this;
    }
    public MyVector sub(MyVector b) {
        
        
        this.x=this.x-b.x ;
        this.y=this.y-b.y ;
        this.z=this.z-b.z ;
        
        return this;
    }
    public MyVector cross(MyVector b) {
        this.x*=b.x ;
        this.y*=b.y ;
        this.z*=b.z ;
        return this;
    }
    public int dot(MyVector b) {
      int dot=b.x*this.x+this.y*b.x+b.z*this.z;
        return dot;
    }
    
    void display(){
        System.out.println("("+this.x+","+this.y+","+this.z+")"); ;
    }
    @Override
    public String toString() {
        return "MyVector{" +
                "x=" + x +
                ", y=" + y +
                ", z=" + z +
                '}';
    }
}

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int x = scanner.nextInt();
        int y = scanner.nextInt();
        int z = scanner.nextInt();

        //(0,0,0)
        MyVector v1 = new MyVector();
        //(x,y,z)
        MyVector v2 = new MyVector(x, y, z);
        //加法
        v1.add(v2).display();
        //减法
        v1.sub(v2).display();
        //叉乘
        v1.cross(v2).display();
        //点乘
        System.out.println(v1.dot(v2));
    }
}

class MyVector {
    private final int x;
    private final int y;
    private final int z;

    //无参构造方法
    public MyVector() {
        this.x = 0;
        this.y = 0;
        this.z = 0;
    }

    //有参构造方法
    public MyVector(int x, int y, int z) {
        this.x = x;
        this.y = y;
        this.z = z;
    }

    //展示坐标
    public void display() {
        System.out.println("(" + x + "," + y + "," + z + ")");
    }

    //加法
    public MyVector add(MyVector myVector) {
        int x = this.x + myVector.x;
        int y = this.y + myVector.y;
        int z = this.z + myVector.z;
        return new MyVector(x, y, z);
    }

    //减法
    public MyVector sub(MyVector myVector) {
        int x = this.x - myVector.x;
        int y = this.y - myVector.y;
        int z = this.z - myVector.z;
        return new MyVector(x, y, z);
    }

    //叉乘
    public MyVector cross(MyVector myVector) {
        int x = this.y * myVector.z - myVector.y * this.z;
        int y = myVector.x * this.z - this.x * myVector.z;
        int z = this.x * myVector.y - myVector.x * this.y;
        return new MyVector(x, y, z);
    }

    //点乘
    public int dot(MyVector myVector) {
        return this.x * myVector.x + this.y * myVector.y + this.z * myVector.z;
    }
}