挖到钻石才停

片段：放在 main 中，单独运行

int durability = 3;
while (durability > 0) {
    System.out.println("挖一下，动作前耐久=" + durability);
    durability--;
}
System.out.println("镐子坏了");

运行结果

挖一下，动作前耐久=3
挖一下，动作前耐久=2
挖一下，动作前耐久=1
镐子坏了

片段：放在 main 中，单独运行

int durability = 0;
while (durability > 0) {
    System.out.println("这一行不会出现");
}
System.out.println("先修工具");

运行结果

先修工具

片段：放在 main 中，单独运行

int durability = 8;
while (durability > 0) {
    durability = Math.max(0, durability - 3);
    System.out.println("剩余耐久=" + durability);
}

运行结果

剩余耐久=5
剩余耐久=2
剩余耐久=0

片段：放在 main 中，单独运行

int blocks = 0, diamondAt = 7;
boolean found = false;
while (!found && blocks < 20) {
    blocks++;
    found = blocks == diamondAt;
}
System.out.println("挖了" + blocks + "块，找到=" + found);

运行结果

挖了7块，找到=true

片段：放在 main 中，单独运行

int choice = 3;
do {
    System.out.println("1 挖矿  2 修理  3 退出");
} while (choice != 3);

运行结果

1 挖矿  2 修理  3 退出

片段：放在 main 中，单独运行

int durability = 0;
do {
    durability += 3;
    System.out.println("修理后=" + durability);
} while (durability < 9);

运行结果

修理后=3
修理后=6
修理后=9

片段：放在 main 中，单独运行

int torches = 0;
while (torches > 0) {
    System.out.println("放火把");
    torches--;
}
System.out.println("结束");

运行结果

结束

片段：放在 main 中，单独运行

int items = 0;
do {
    System.out.println("检查箱子");
} while (items > 0);

运行结果

检查箱子

片段：放在 main 中，单独运行

java.util.Random random = new java.util.Random(10);
int cost = 1 + random.nextInt(4);
System.out.println(cost);

运行结果

3

片段：放在 main 中，单独运行

java.util.Random random = new java.util.Random(10);
int count = 0;
while (count < 5) {
    int cost = 1 + random.nextInt(4);
    System.out.println(cost);
    count++;
}

运行结果

3
2
2
2
1

片段：放在 main 中，单独运行

int blocks = 0;
while (blocks < 3) {
    blocks++;
    System.out.println("已挖" + blocks + "块");
}

运行结果

已挖1块
已挖2块
已挖3块

片段：放在 main 中，单独运行

int durability = 7;
while (durability > 0) {
    durability = Math.max(0, durability - 2);
    System.out.println(durability);
}

片段：放在 main 中，单独运行

int blocks = 0;
boolean found = false;
while (!found && blocks < 3) {
    blocks++;
}
System.out.println(blocks + ":" + found);

片段：放在 main 中，单独运行

int energy = 0;
do {
    System.out.println("检查");
} while (energy > 0);

DurabilitySimulator.java · 上半部分，下一页继续

import java.util.Random;

public class DurabilitySimulator {
    public static void main(String[] args) {
        final int START_DURABILITY = 24;
        final int SAFETY_LIMIT = 50;
        int durability = START_DURABILITY, blocksMined = 0;
        Random random = new Random(10);
        if (START_DURABILITY < 0 || START_DURABILITY > 100
                || SAFETY_LIMIT < 0 || SAFETY_LIMIT > 100) {
            System.out.println("耐久和上限必须在0到100之间");
        } else {
            System.out.println("=== 工具耐久模拟 ===");
            while (durability > 0 && blocksMined < SAFETY_LIMIT) {
                int cost = 1 + random.nextInt(4);
                blocksMined++;
                durability = Math.max(0, durability - cost);
                String bar = "#".repeat(durability / 2);
                System.out.printf("第%02d块 消耗%d 剩余%02d %s%n",
                        blocksMined, cost, durability, bar);
            }

DurabilitySimulator.java · 紧接上一页

            if (durability == 0) {
                System.out.println("工具损坏，停止挖掘");
            } else {
                System.out.println("触发安全上限，带着工具回家");
            }
            System.out.println("共挖掘：" + blocksMined + "块");
        }
    }
}