JAVA的作业，求大神啊~构造一个立方体类，类的构成包括如下内容：（1）成员变量为长、宽、高；（2）初始化立方体（设置长

public class Cube {
private int length;
private int width ;
private int height;
public Cube(int length, int width, int height) {
super();
this.length = length;
this.width = width;
this.height = height;
}
public Cube() {
this.length = 10;
this.width = 10;
this.height = 10;
}
public void setLength(int length) {
this.length = length;
}
public void setWidth(int width) {
this.width = width;
}
public void setHeight(int height) {
this.height = height;
}
public int getVolume(){
return length*width*height;
}
public static void main(String[] args) {
Cube cube= new Cube();
System.out.println(cube.getVolume());
Cube cube2= new Cube(20,30, 40);
System.out.println(cube2.getVolume());
}
}