谢谢。利用java编程。创建一个Box类，在其中定义三个变量表示一个立方体的长，宽，高，再定义一个方法setD

Question

对这三个变量进行初始化，然后定义一方法求立方体的体积。创建一个对象，求给定尺寸的立方体的体积。
希望可以写出完整的程序，并且帮我看看我写的这个程序代码，出错的地方？
class box {

private int x,y,z;

public void setDemo(){
x=3;
y=4;
z=5;

}

public void calculate(int x,int y,int z){
int t;
t=x*y*z;
System.out.println(t);

}

}

public class Box{

public static void main(String[] args) {
int t;
box d=new box();
d.setDemo();
d.calculate(3,4,5);

}
}
//
银行账户
date disposit withdraw left
2000.3.9 2000 2000
2002.5.5 3000 5000
2002.6.1 600 4400
2002.8.1 1500 2900
Press any key to continue...
程序
/**
* AWT Sample application
*
* @author
* @version 1.00 11/04/06
*/
class Bank{
final int Max=100;
private int top;
private String date[]=new String[Max];
private int money[]=new int[Max];
private int rest[]=new int[Max];
private static int sum=0;

Bank(){top=0;}
void bankin(String d,int m)
{
date[top]=d;
money[top]=m;
sum=sum+m;
rest[top]=sum;
top++;

}

void bankout(String d,int m)
{
date[top]=d;
money[top]=-m;
sum=sum-m;
rest[top]=sum;
top++;

}

void display()
{
System.out.println("date disposit withdraw left ");
for(int i=0;i<top;i++)
{
System.out.print(date[i]);
if(money[i]<0)
System.out.print(" "+(-money[i]));
else
System.out.print(" "+money[i]+" ");
System.out.println(" "+rest[i]);
}
}
}

public class TestBank {

public static void main(String[] args) {
Bank b=new Bank();
b.bankin("2000.3.9",2000);
b.bankin("2002.5.5",3000);
b.bankout("2002.6.1",600);
b.bankout("2002.8.1",1500);
b.display();
}
}

Answer 1

你的这个问题 是你定义类的问题,java虽然大小敏感，但是根据命名规范 一般类名首字母需要大写，你2个类定义为同名，就是首字母大小写不同，建议你改下。当然文件名得跟public类名一样
class Box{

private int x,y,z;

public void setDemo(){
x=3;
y=4;
z=5;

}

public void calculate(int x,int y,int z){
int t;
t=x*y*z;
System.out.println(t);

}

}

public class Test{

public static void main(String[] args) {
int t;
Box d=new Box();
d.setDemo();
d.calculate(3,4,5);

}
}

Answer 2

class Box{
private double length;
private double width;
private double height;

public void setDemo(){
this.length = 3;
this.width = 4;
this.height = 5;
}

//计算长方体的体积
public double getVolume(){
return this.length * this.width * this.height;
}
}
public class Test11 {
public static void main(String[] args) {
Box b = new Box();
b.setDemo();
System.out.println("立方体 b 的体积是 " + b.getVolume());
}
}

Answer 3

ivate int data;
private String str;

public A(){
data = 0;
str = "";
}

public A(int data,String str){
this.data = data;
this.str = str;
}

public void add(int k,String s){
this.data+=k;
this.str+=s;
}

public void clear(){
this.data = 0;
this.str = "";
}

public String toString(){
String s = data+"";
s+=str;
return (s);
}

public static void main(String args[]){
A a = new A();
a.add(10,"Hello");
System.out.println("data is:"+a.data+" str is:"+a.str);
System.out.println(a.toString());
a.clear();
A b = new A(199,"nihao");
System.out.println("data is:"+b.data+" str is:"+b.str);
System.out.println(b.toString());
b.add(200, " dajiahao");System.out.println("data is:"+b.data+" str is:"+b.str);
System.out.println(b.toString());
}
}

Answer 4

public class Box
{
private double length;
private double width;
private double height;

public void setD()
{
this.length=3;
this.width=4;
this.height=5;
}

public double cal_volume()
{
return(this.length*this.width*this.height);
}

public static void main(String[] args)
{
Box b=new Box();
b.setD();
System.out.println("the volume of the cuboid is "+b.cal_volume());

}

}