Java 初学者堆栈类返回对象的引用,而不是名称
这是我正在写的一个项目的代码。我们的想法是去不同的行星旅行,把这些“行星”推到我制作的自定义堆栈类上。我目前正在尝试一种方法,当你输入这些基于对象的行星时,它会弹出。然而,我写它有困难 主要方法:Java 初学者堆栈类返回对象的引用,而不是名称,java,object,stack,Java,Object,Stack,这是我正在写的一个项目的代码。我们的想法是去不同的行星旅行,把这些“行星”推到我制作的自定义堆栈类上。我目前正在尝试一种方法,当你输入这些基于对象的行星时,它会弹出。然而,我写它有困难 主要方法: public static void main(String[] args) { StackX theStack = new StackX(99); String current = "Enterprise"; int logOut = 1; String plane
public static void main(String[] args) {
StackX theStack = new StackX(99);
String current = "Enterprise";
int logOut = 1;
String planetName;
int secretCode;
//This is the start out, do not loop this
System.out.println("You are on the enterprise, where would you like to teleport?");
//while loop will be done after reaching Io
do {
Scanner input = new Scanner(System.in);
//Grab input from user
System.out.println("Enter a planet name: ");
planetName = input.nextLine();
System.out.println("Enter a the four digit code for " + planetName + ": ");
secretCode = input.nextInt();
if (current.equals("Enterprise")){
if (planetName.equalsIgnoreCase("Europa") && secretCode == 9007){
current = planetName;
Moon Europa = new Moon(planetName, secretCode);
theStack.push(Europa);
} else if (planetName.equalsIgnoreCase("Titan") && secretCode == 1232){
current = planetName;
Moon Titan = new Moon(planetName, secretCode);
theStack.push(Titan);
} else if (planetName.equalsIgnoreCase("Rhea") && secretCode == 5623){
current = planetName;
Moon Rhea = new Moon(planetName, secretCode);
theStack.push(Rhea);
} else {
logOut = 0;
System.out.println("You are dead.");
}
} else if (current.equals("Titan")){
if (planetName.equalsIgnoreCase("Enterprise") && secretCode == 1212){
current = planetName;
Moon Enterprise = new Moon(planetName, secretCode);
theStack.push(Enterprise);
} else if (planetName.equalsIgnoreCase("Rhea") && secretCode == 5623){
current = planetName;
Moon Rhea = new Moon(planetName, secretCode);
theStack.push(Rhea);
} else if (planetName.equalsIgnoreCase("Elara") && secretCode == 1264){
current = planetName;
Moon Elara = new Moon(planetName, secretCode);
theStack.push(Elara);
} else {
logOut = 0;
System.out.println("You are dead.");
}
} else if (current.equals("Rhea")){
if (planetName.equalsIgnoreCase("Enterprise") && secretCode == 1212){
current = planetName;
Moon Enterprise = new Moon(planetName, secretCode);
theStack.push(Enterprise);
} else if (planetName.equalsIgnoreCase("Titan") && secretCode == 1232){
current = planetName;
Moon Titan = new Moon(planetName, secretCode);
theStack.push(Titan);
} else if (planetName.equalsIgnoreCase("Europa") && secretCode == 9007){
current = planetName;
Moon Europa = new Moon(planetName, secretCode);
theStack.push(Europa);
} else {
logOut = 0;
System.out.println("You are dead.");
}
} else if (current.equals("Europa")){
if (planetName.equalsIgnoreCase("Enterprise") && secretCode == 1212){
current = planetName;
Moon Enterprise = new Moon(planetName, secretCode);
theStack.push(Enterprise);
} else if (planetName.equalsIgnoreCase("Rhea") && secretCode == 5623){
current = planetName;
Moon Rhea = new Moon(planetName, secretCode);
theStack.push(Rhea);
} else if (planetName.equalsIgnoreCase("Metis") && secretCode == 2535){
current = planetName;
Moon Metis = new Moon(planetName, secretCode);
theStack.push(Metis);
} else {
logOut = 0;
System.out.println("You are dead.");
}
} else if (current.equals("Elara")){
if (planetName.equalsIgnoreCase("Titan") && secretCode == 1232){
current = planetName;
Moon Titan = new Moon(planetName, secretCode);
theStack.push(Titan);
} else if (planetName.equalsIgnoreCase("Metis") && secretCode == 2535){
current = planetName;
Moon Metis = new Moon(planetName, secretCode);
theStack.push(Metis);
} else {
logOut = 0;
System.out.println("You are dead.");
}
} else if (current.equals("Metis")){
if (planetName.equalsIgnoreCase("Europa") && secretCode == 9007){
current = planetName;
Moon Europa = new Moon(planetName, secretCode);
theStack.push(Europa);
} else if (planetName.equalsIgnoreCase("Elara") && secretCode == 1264){
current = planetName;
Moon Elara = new Moon(planetName, secretCode);
theStack.push(Elara);
} else if (planetName.equalsIgnoreCase("Io") && secretCode == 4792){
current = planetName;
Moon Io = new Moon(planetName, secretCode);
theStack.push(Io);
System.out.println("You have acquired the Macho Orb!");
} else {
logOut = 0;
System.out.println("You are dead.");
}
} else if (current.equals("Io")){
if (planetName.equalsIgnoreCase("Metis") && secretCode == 2535){
current = planetName;
Moon Metis = new Moon(planetName, secretCode);
theStack.push(Metis);
} else {
logOut = 0;
System.out.println("You are dead.");
}
} else {
logOut = 0;
System.out.println("You are dead.");
}
} while((!current.equals("Io")) && (logOut != 0));
//Pop method
Scanner input = new Scanner(System.in);
System.out.println("Return to the Enterprise using the same path.");
System.out.println("Enter a planet name: ");
planetName = input.nextLine();
System.out.println("Enter a the four digit code for " + planetName + ": ");
secretCode = input.nextInt();
while(!theStack.isEmpty() ){
if(planetName.equals(current)){
theStack.pop();
}
}
}
堆栈类:
class StackX {
private int maxSize; // size of stack array
private Object[] stackArray;
private int top; // top of stack
public StackX(int s) // constructor
{
maxSize = s; // set array size
stackArray = new Object[maxSize]; // create array
top = -1; // no items yet
}
public void push(Object j) // put item on top of stack
{
stackArray[++top] = j; // increment top, insert item
}
public void pop() // take item from top of stack
{
if(stackArray[top]!=null){
stackArray[top]=null;
top--;
}
}
public Object peek() // peek at top of stack
{
return stackArray[top];
}
public boolean isEmpty() // true if stack is empty
{
return (top == -1); // = = returns true or false
}
public boolean isFull() // true if stack is full
{
return (top == maxSize-1); // = = returns true or false
}
} // end class StackX
月球类(创建月球对象):
我正在尝试写的pop方法就在这里。我考虑过使用stack类中的peek()方法来比较堆栈顶部的输入,但是peek()方法只返回对peek对象的引用。有更好的方法吗?如果可能的话,我想将对象的名称和代码(int值)与给定的输入进行比较。我知道代码非常混乱,没有任何方法,但是请帮个忙
//Pop method
Scanner input = new Scanner(System.in);
System.out.println("Return to the Enterprise using the same path.");
System.out.println("Enter a planet name: ");
planetName = input.nextLine();
System.out.println("Enter a the four digit code for " + planetName + ": ");
secretCode = input.nextInt();
while(!theStack.isEmpty() ){
if(planetName.equals(current)){
theStack.pop();
}
}
嗯,这里似乎需要一个可搜索的集合,而不是堆栈。您应该使用
列表
来保存对象。稍后,您可以迭代它并检查所需的对象
看
当然,它会返回一个对象引用。这就是你要放在堆栈中的内容。您的
while
循环逻辑也错误。它将进入一个无限循环。@Kayaman我知道while循环将是无限的,最后一部分只是一个粗略的轮廓,它需要如何。我只需要知道如何比较对象名和代码,而不是引用(如果可能的话),这就是为什么在Planet类中有getName()
方法。这些代码都是你的吗?因为编写这么多代码,然后在自己的类上调用方法时遇到问题,这似乎很奇怪……我已经编写了所有这些代码,我基于对象的编程知识有点生疏,这就是为什么。我知道getName()和getCode()方法可以返回对象的名称和代码,但是我在实现它时遇到了困难。但是您已经完成了所需的比较,例如。为月球做这件事并没有什么不同。它们显然是为了编写自己的堆栈类。
//Pop method
Scanner input = new Scanner(System.in);
System.out.println("Return to the Enterprise using the same path.");
System.out.println("Enter a planet name: ");
planetName = input.nextLine();
System.out.println("Enter a the four digit code for " + planetName + ": ");
secretCode = input.nextInt();
while(!theStack.isEmpty() ){
if(planetName.equals(current)){
theStack.pop();
}
}