具有多个方法和构造函数的Java Box程序
具有多个方法和构造函数的Java Box程序
提问于 2018-10-19 07:25:01
我是编程的初学者，特别是在使用构造函数方面遇到了麻烦。我必须为我的一个实验编写一个程序，它必须只包含以下内容：
复制三个实例变量-长度、宽度和高度(每个都是双精度类型)复制一个实例变量-输入(类型扫描器)初始化为System.in
- Default构造函数(no-arg) -将所有三个实例变量初始化为1个variables
- Copy初始构造函数-初始化所有三个实例Box
- inputWidth，构造函数-
- inputLength，基于用户输入设置实例变量的inputHeight方法没有参数并且不返回值。
- 显示长度X宽度X高度(用“X”分隔)并且不返回值的displayDimensions方法。
- 没有参数并且计算box
体积的displayDimensions方法
我们还获得了应用程序BoxTest，其中的输出必须与以下内容完全匹配：
- 默认尺寸为1.0 X 1.0 X 1.0，体积为1.0
- 初始尺寸为8.5 X 11.0 X 1.0，体积为93.5
- 复制尺寸为8.5 X 11.0 X 1.0，体积为93.5
- 更新长度:1
<>H133输入宽度:2<代码>H234<代码>H135输入高度:3<代码>H137更新后的尺寸为1.0 X 2.0 X 3.0，体积为6.0<代码>F239
下面是我的代码：
import java.util.Scanner;
public class Box {
public static void main(String args[]) {
double length, width, height;
Scanner input=new Scanner(System.in);
new Box() { //
Box defaultBox=new Box();
double length = 1.0;
double width = 1.0;
double height = 1.0;
System.out.print("Default dimensions are " + length + " X " + width + " X " + height);
defaultBox.displayDimensions();
System.out.println(" with volume of "+defaultBox.calcVolume());
Box initialBox=new Box(length, width, height);
length = 8.5;
width = 11.0;
height = 1.0;
System.out.print("Initial dimensions are " + length + " X " + width + " X " + height);
initialBox.displayDimensions();
System.out.println(" with volume of "+initialBox.calcVolume());
Box copyBox=new Box(initialBox);
System.out.print("Copied dimensions are " + length + " X " + width + " X " + height);
copyBox.displayDimensions();
System.out.println(" with volume of "+copyBox.calcVolume());
System.out.println("\nUpdate dimensions");
initialBox.inputLength();
initialBox.inputWidth();
initialBox.inputHeight();
System.out.print("Updated dimensions are ");
initialBox.displayDimensions();
System.out.println(" with volume of "+initialBox.calcVolume());
}
double inputLength() {
Scanner input;
double length = input.nextDouble();
}
double inputWidth() {
Scanner input;
double width = input.nextDouble();
}
double inputHeight() {
Scanner input;
double height = input.nextDouble();
}
double displayDimensions(double length, double width, double height) {
Scanner input;
}
double calcVolume() {
}
}我遗漏了什么？我的程序将无法编译，并给出错误消息
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Syntax error, insert "Identifier (" to complete MethodHeaderName
Syntax error, insert ")" to complete MethodDeclaration
Syntax error, insert ";" to complete MethodDeclaration
Syntax error, insert "}" to complete ClassBody
at Box.main(Box.java:18)回答 1
Stack Overflow用户
发布于 2018-10-19 08:16:19
正如我在评论中所说的，您已经将所有内容都放在了main中。别干那事。实际上，您的Box类基本上是空的，并且您当前几乎是在main中创建一个匿名子类。您的说明没有提到main，但是非常直接。你应该写下这样的东西
public class Box {
// Three instance variables – length, width and height (each of type double)
private double length, width, height;
// One instance variables – input (type Scanner) initialized to System.in
private Scanner input = new Scanner(System.in);
// Default constructor (no-arg) – initialize all three instance variables to 1
public Box() {
this.length = this.width = this.height = 1;
}
// Initial constructor – initialize all three instance variables
public Box(double length, double width, double height) {
this.length = length;
this.width = width;
this.height = height;
}
// Copy constructor – copy Box
public Box(Box b) {
this(b.length, b.width, b.height);
}
// inputWidth, inputLength, and inputHeight methods that set the instance
// variables based on user input have not parameters and do not return a value.
public void inputWidth() {
this.width = input.nextDouble();
}
public void inputLength() {
this.length = input.nextDouble();
}
public void inputHeight() {
this.height = input.nextDouble();
}
// a displayDimensions method that displays the length X Width X height
// (separated by “X”) and does not return a value.
public void displayDimensions() {
System.out.printf("%.2fX%.2fX%.2f%n", length, width, height);
}
// a calcVolume method that has no parameters and calculates the volume of the
// box
public double calcVolume() {
return length * width * height;
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/52883883
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