...宽(width)两个属性,有成员函数计算矩形的面积。并构造一个Rectangle...

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public class Rectangle {
public double len;
public double width;
public double getArea(double len,double width){
return len*width;
}

public double getLen() {
return len;
}
public void setWidth(double len) {
this.len = len;
}
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}

public static void main(String[] args) {
Rectangle r = new Rectangle(40, 10);
System.out.println(r.getArea(r.getLen(), r.getWidth()));
}

}

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......

热心网友

public class Rectangle {
public double len;
public double width;
public double getArea(double len,double width){
return len*width;
}

public double getLen() {
return len;
}
public void setWidth(double len) {
this.len = len;
}
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}

public static void main(String[] args) {
Rectangle r = new Rectangle(40, 10);
System.out.println(r.getArea(r.getLen(), r.getWidth()));
}

}