java - True boolean while 语句在嵌套 if 中不退出循环

Question

当我在循环内设置 while1 = false 时，其中 while1 的值为 true 并且循环条件为 while(while1) ，它应该退出循环。但在嵌套的 if 语句中，它似乎并没有这样做。

package javanotes;
import java.util.Scanner;

public class EggsCount {

    static Scanner var1 = new Scanner(System.in);

    public static void main (String[] args){    

        int eggNumber;
        int eggsGross;
        int eggsDozen;
        int eggsSingle;
        int eggsGrossRemainder;
        int eggsDozenRemainder;
        boolean while1 = true;
        boolean while2 = true;

        System.out.println("How many eggs do you have?");
        eggNumber = var1.nextInt();

        while (while1){
            if (eggNumber > 144){
                eggsGross = eggNumber / 144;
                eggsGrossRemainder = eggNumber % 144;

                if(eggsGrossRemainder > 12) {
                    eggsDozen = eggsGrossRemainder / 12;
                    eggsDozenRemainder = eggsGrossRemainder % 12;
                    if (eggsDozenRemainder > 0){
                        eggsSingle = eggsDozenRemainder;
                        System.out.println("You have " + eggsGross + " gross amount of eggs, " + eggsDozen + " dozens mounts of eggs, and "
                                + eggsSingle + " remainder eggs.");
                        while1 = false;
                    }
                    System.out.println("You have " + eggsGross + " gross amount of eggs and " + eggsDozen + " dozens mounts of eggs.");
                    while1 = false;
                }
                System.out.println("You have " + eggsGross + " gross amounts of eggs.");
                while1 = false;
            }
            else if(eggNumber <= 144 && eggNumber >= 12){
                eggsDozen = eggNumber / 12;
                eggsDozenRemainder = eggNumber % 12;
                if (eggsDozenRemainder > 0){
                    eggsSingle = eggsDozenRemainder;
                    System.out.println("You have " + eggsDozen + " dozen eggs and " + eggsSingle + " remainders.");
                    while1 = false;
                }
                System.out.println("You have " + eggsDozen + " dozen eggs.");
                while1 = false;
            }
            else if (eggNumber > 0 && eggNumber < 12){
                eggsSingle = eggNumber;
                System.out.println("You have no Gross amounts or Dozen amounts, only " + eggsSingle + " singles.");
                while1 = false;
            }
            else{
                System.out.println("C'mon now... let's put a normal value in:");
            }
        }
    }
}

Answer 1

将 boolean 值变为 false，意味着循环不会完成另一轮，但它将继续沿其路径前进，即“47”个鸡蛋>12且小于“144”，eggsDozenRemainder >0，因此 if block 将运行，但是后面的 block 也会运行，因为如果决策不是互斥的，请尝试 If (){}else{}

尝试控制流程图 http://en.wikipedia.org/wiki/Control_flow_diagram帮助理解。