Java 如何在getArrow（）本地更改if（ab）中x和y的值 公共类箭头{ 受保护的静态int x； 保护静电干扰； 公共无效集a（布尔值a）{ 这个a=a； } 公共空立根（布尔b）{ 这个.b=b； } 公共无效集合ab（布尔值ab）{ this.ab=ab； } 公共箭头（int x1，int y1）{ 这是x=x1； 这是y=y1； } 公共双getySpeed（）{ 返回（-y速度*时间+时间*时间/10）； } 公共布尔getX（）{ return x+Math.abs（xSpeed*Time）

您面临问题的原因是您已将

x

和

y

声明为

static

使它们成为类变量，这意味着它们的值对于所有对象都是相同的

public class Arrow {
protected  static int x;
protected  static int y;

public void setA(boolean a) {
    this.a = a;
}

public void setB(boolean b) {
    this.b = b;
}

public void setAb(boolean ab) {
    this.ab = ab;
}

public Arrow( int x1, int y1) {
   this.x=x1;
    this.y=y1;
}
public double getySpeed(){

    return (-ySpeed*Time+Time*Time/10);
}
public boolean getX(){
    return x +Math.abs(xSpeed * Time)<canvasWidth-90;
}
public boolean getY(){
    return y+getySpeed()<canvasHeight-110;
}

public Matrix getArrow(){
    Matrix matrix = new Matrix();//1140,540

    matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
    if (a&&!ab) {
       // here if i do sout(x) it will show 75 which is the value i gave it in the constructor
        return a(x);
    }
   if(b&&!ab){
        // here if i do sout(y) it will show 125 which is the value i gave it in the constructor
       return (b(y));
    }
    if(ab){
            x =x+(int) Math.abs(xSpeed * Time);
            y = y+(int)getySpeed();
            matrix.postTranslate(x,y );
        }
    return matrix;
}
public Matrix b(int yy ){
    Matrix matrix = new Matrix();
    matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
    matrix.postTranslate(canvasWidth-90,yy );

    return matrix;
}
public Matrix a(int xx ){
    Matrix matrix = new Matrix();
    matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
    matrix.postTranslate(xx,canvasHeight-100 );

    return matrix;
}

只需从他们的声明中删除术语，

static

---

如果有任何疑问/问题，请随时发表评论。

您面临问题的原因是您已将

x

和

y

声明为

静态

使它们成为类变量，这意味着它们的值对于所有对象都是相同的

public class Arrow {
protected  static int x;
protected  static int y;

public void setA(boolean a) {
    this.a = a;
}

public void setB(boolean b) {
    this.b = b;
}

public void setAb(boolean ab) {
    this.ab = ab;
}

public Arrow( int x1, int y1) {
   this.x=x1;
    this.y=y1;
}
public double getySpeed(){

    return (-ySpeed*Time+Time*Time/10);
}
public boolean getX(){
    return x +Math.abs(xSpeed * Time)<canvasWidth-90;
}
public boolean getY(){
    return y+getySpeed()<canvasHeight-110;
}

public Matrix getArrow(){
    Matrix matrix = new Matrix();//1140,540

    matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
    if (a&&!ab) {
       // here if i do sout(x) it will show 75 which is the value i gave it in the constructor
        return a(x);
    }
   if(b&&!ab){
        // here if i do sout(y) it will show 125 which is the value i gave it in the constructor
       return (b(y));
    }
    if(ab){
            x =x+(int) Math.abs(xSpeed * Time);
            y = y+(int)getySpeed();
            matrix.postTranslate(x,y );
        }
    return matrix;
}
public Matrix b(int yy ){
    Matrix matrix = new Matrix();
    matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
    matrix.postTranslate(canvasWidth-90,yy );

    return matrix;
}
public Matrix a(int xx ){
    Matrix matrix = new Matrix();
    matrix.postRotate((int)getAngle(), arrowWidth/2, arrowHeight / 2);
    matrix.postTranslate(xx,canvasHeight-100 );

    return matrix;
}

只需从他们的声明中删除术语，

static

如有任何疑问/问题，请随时发表评论