我在代码中有两个 equals 方法，但它们都不起作用。我自己做了一个，然后我还通过源代码从 Eclipse 自动生成了一个。我已经用一个或另一个多次运行该程序，但都不起作用。
import java.util.Arrays;
import java.util.Scanner;
import java.math.*;
public class Item {
static //the properties of an Item
double cash=59;
static double sum=0;
private int priority;
private String name;
private double price;
//default constructer
public Item() {
priority = -1; //fill with default values
price = 0.0;
name = "No name yet";
}
public Item(int priority, String name, double price) {//constructor with all 3 arguments
this.priority = priority;
this.name = name;
this.price = price;
}
public int getPriority() {
return priority;
}
public void setPriority(int priority) {
//priority must be between 1 and 7
if (priority > 0 && priority <= 7) {
this.priority = priority;
} else {
//otherwise default to 0
System.err.println("Error, enter 1 through 7");
//this.priority = 0;
}
}
public String getName() {
return name;
}
public void setName(String name) {
//would I put equals method here. name.equals.name?
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
//price between 0 and 100 inclusive
if (price >= 0.00) {
if (price <= 100.00) {
this.price = price;
cash = cash-=price;
sum=sum+=price;
} else {
System.err.println("Error: price to high");
}
} else {
System.err.println("Error: price to low");
}
}
public boolean equals(Item otherItem){
if(this.getPriority()==otherItem.getPriority());
System.err.println("Error, Same Priorities detected");
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + priority;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof Item)) {
return false;
}
Item other = (Item) obj;
if (priority != other.priority) {
return false;
}
System.err.println("Error, Same Priorities detected");
return true;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("Item [Price=").append(getPrice()).append(", ");
if (getName() != null) {
builder.append("Name=").append(getName()).append(", ");
}
builder.append("Priority=").append(getPriority()).append("]");
return builder.toString();
}
public static void main(String[] args) {
Item[] list = new Item[2];
Scanner keyboard = new Scanner(System.in);
for (int i = 1; i <= list.length; i++) {
if(cash==59)
{
System.out.println("You have 59 dollars");
}
Item anItem = new Item(); // new item object created 7 times
System.out.println("Enter an item you want to add to your list " + i);
anItem.setName(keyboard.next());
System.out.println("Enter a price " + i);
anItem.setPrice(keyboard.nextDouble());
System.out.println("Enter the priority of the item " + i);
anItem.setPriority(keyboard.nextInt());
list[i-1] = anItem;
System.out.println(Arrays.toString(list));
System.out.println("Cash left "+cash);
System.out.println("Sum of Items "+sum);
if(sum>59)
{System.out.println("Error, you ran out of money");
System.out.println(Arrays.toString(list));}
}
System.out.println( list[1].getPriority());
}
}