错误：int 无法转换为 String，当我使用：timer = new Timer(1000, this);

Question

我做了一个计时器，我通过 timer = new Timer(1000, this); 声明了它。 （完整代码见下文）。但我收到错误：错误：不兼容的类型：int 无法转换为 java.lang.String。这是否意味着编译器认为“this”是一个字符串或..？我应该怎么做才能修复这个错误？

import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.JFrame;

public class Snake extends JFrame implements KeyListener, ActionListener{
/*Painter painter;
LinkedList<Point> snakeList;*/
Timer timer;
/*int direction;
int snakeSize;
int movementX, movementY;*/

public static void main(String[] arg){
    new Snake();
}

public Snake(){
    /*painter = new Painter(this);
    this.add(painter, BorderLayout.CENTER);
    this.setSize(500, 500);
    this.setResizable(false);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setVisible(true);
    this.addKeyListener(this);
    this.requestFocusInWindow();*/
    timer = new Timer(1000, this);
    /*startGame();*/
}

/*public void startGame(){
    snakeList = new LinkedList<Point>();
    snakeList.addFirst(new Point(30,30));
    snakeSegments(3);
    movementX = 0;
    movementY = 0;
}

public void gameUpdate(){
    snakeMove(movementX, movementY);
    repaint();
}

public void snakeSegments(int i){
    snakeSize = getSnakeSize();
    while(snakeSize > 0){
        snakeList.addLast(new Point(getLast()));
        snakeSize--;
    } 
}

public void snakeInstructor(){
    int currentDirection = getDirection();
    if (currentDirection == 1){
        snakeMove(-1, 0);
    } else if (currentDirection == 2){
        snakeMove(1, 0);
    } else if (currentDirection == 3){
        snakeMove(0, 1);
    } else if (currentDirection == 4){
        snakeMove(0, -1);
    }      
}

public void snakeMove(int directionX, int directionY){
    snakeList.getFirst().x = snakeList.getFirst().x + directionX;
    snakeList.getFirst().y = snakeList.getFirst().y + directionY;
    for(int i = getSnakeSize()-1; i >=1; i--) {
        snakeList.get(i).setLocation(snakeList.get(i-1));
    }
}

public void setDirection(int newDirection){
    direction = newDirection;
}

public int getDirection (){
    return direction;
}

public boolean isEmpty(){
    return true;
}

Point getFirst(){
    return snakeList.getFirst();
}

Point getLast(){
    return snakeList.getLast();
}

Point get(int i){
    return snakeList.get(i);
}

public void addFirst(Point p){
    snakeList.addFirst(p);
}

public void addLast(Point p){
    snakeList.addLast(p);
}

public Point removeFirst(){
    snakeList.removeFirst();
    return null;
}

public Point removeLast(){
    snakeList.removeLast();
    return null;
}

public int getSnakeSize(){
    return snakeList.size();
}

public void setSnakeSize(){
    snakeSize = snakeList.size() + 1;
}*/

@Override
public void actionPerformed(ActionEvent event) {
    gameUpdate();
}

/*@Override public void keyReleased(KeyEvent e){ }
@Override public void keyTyped(KeyEvent e){ }
@Override public void keyPressed(KeyEvent e){
    int key = e.getKeyCode();
    if((key == KeyEvent.VK_LEFT) && direction != 2){
        setDirection(1);
    } else if ((key == KeyEvent.VK_RIGHT) && direction != 1){
        setDirection(2);
    } else if ((key == KeyEvent.VK_UP) && direction != 4){
        setDirection(3);
    } else if ((key == KeyEvent.VK_DOWN) && direction != 3){
        setDirection(4);
    } else if (key == KeyEvent.VK_SPACE){
        startGame();
    }
}*/

}

Answer 1

您已导入 java.util.Timer，但您似乎想要使用 javax.swing.Timer