一元运算符感叹号的错误操作数类型 actionlistener

Question

我在第 2 行收到 "bad operand type actionlistener for unary operator !" 错误，在第 2 行和第 8 行收到错误“不兼容的类型：布尔值无法转换为 ActionListener。我在 . start() 指出找不到符号开始。有人知道这里出了什么问题吗？

private void walkjButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
    if(!walk){ //error here
        walk = true; //here
        timer = new Timer(40, walk);
        walk.start(); //here
    }
    else{
        timer.stop();
        walk = false; //and here      
    }
}                                           

private ActionListener walk = new ActionListener(){
    public void actionPerformed(ActionEvent e){
        if(leftLegWalk){
            while (leftLegLength <=50){
                leftLegLength -= 5;
                }
            while (leftLegLength >=20) {
                    leftLegLength +=5;
                }
            }
        else {
            while (rightLegLength <=50) {
                rightLegLength -=5;
                }
            while (rightLegLength >=20) {
                rightLegLength += 5;
                }
            }
        }
    };

boolean running = false;
int count = 0; 
boolean wave = true;
boolean leftLegWalk = true;
boolean rightLegWalk = false;
int leftLegLength = 50;
int rightLegLength = 50;
private Timer timer;

Answer 1

您混淆了变量。变量 walk 是一个 ActionListener。您不能将其视为 boolean（使用 [=14= 测试其真值]，分配 true 或 false）或作为 Thread（调用 start()).很难确定你想要完成什么，但我认为你想要的是：

private void walkjButtonActionPerformed(java.awt.event.ActionEvent evt) {                                            
    if(!running){
        running = true;
        timer = new Timer(40, walk);
        timer.start();
    }
    else{
        timer.stop();
        running = false;
    }
}

一元运算符感叹号的错误操作数类型 actionlistener

bad operand type actionlistener for unary operator exclamation mark

java

netbeans

operators

actionlistener