java - If 语句总是给出相同的答案

Question

import java.util.Scanner;

class Practice {

public static void main(String args[]) {

    System.out.println("Enter the number of treats you have:");
    Scanner treatsScanner = new Scanner(System.in);
    int treats = (treatsScanner.nextInt());

    System.out.println("Enter the number of hamsters you have:");
    Scanner hamstersScanner = new Scanner(System.in);
    int hamsters = (hamstersScanner.nextInt());

    System.out.println("How many treats does each hamster need?");
    Scanner neededTreatsScanner = new Scanner(System.in);
    int neededTreats = (neededTreatsScanner.nextInt());     

    int treatsPerHamster = treats / hamsters;
    boolean enoughTreats = treatsPerHamster >= neededTreats;        

    if (enoughTreats = true) {
        System.out.println("There are enough treats for all the hamsters!");
    }
    else if (enoughTreats = false) {
        System.out.println("Oh no! There aren't enough treats!");        
    }

}
}

有人可以向我解释为什么这个程序返回“所有的仓鼠都有足够的零食!”不管是否“neededTreats”>“treatsPerHamster”？

谢谢。

Answer 1

你应该使用 == 而不是 =

    if (enoughTreats == true) {
        System.out.println("There are enough treats for all the hamsters!");
    }
    else {
        System.out.println("Oh no! There aren't enough treats!");        
    }

请记住，== 是比较运算符，= 是赋值运算符。

正如 Mike 所提到的，只需使用 if(enoughTreats) 就可以解决问题。无需使用 == 运算符!

事实上，您根本不需要 boolean 变量 enoughTreats。你可以这样写你的条件:

if (treatsPerHamster >= neededTreats) {
    // do one thing
}
else {
    // do other
}