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View Compilation Error

0_0_39747721_9531\Main.java:29: 错误: 需要:
            case 1 -> stack.push(m);
                  ^
0_0_39747721_9531\Main.java:29: 错误: 非法的表达式开始
            case 1 -> stack.push(m);
                   ^
0_0_39747721_9531\Main.java:29: 错误: 需要';'
            case 1 -> stack.push(m);
                           ^
0_0_39747721_9531\Main.java:31: 错误: 需要:
            case 2 -> queue.add(m);
                  ^
0_0_39747721_9531\Main.java:31: 错误: 非法的表达式开始
            case 2 -> queue.add(m);
                   ^
0_0_39747721_9531\Main.java:31: 错误: 需要';'
            case 2 -> queue.add(m);
                           ^
0_0_39747721_9531\Main.java:39: 错误: 需要:
            case 1 -> {
                  ^
0_0_39747721_9531\Main.java:39: 错误: 非法的表达式开始
            case 1 -> {
                   ^
0_0_39747721_9531\Main.java:39: 错误: 需要';'
            case 1 -> {
                     ^
0_0_39747721_9531\Main.java:45: 错误: 孤立的case
            case 2 -> {
            ^
0_0_39747721_9531\Main.java:45: 错误: 需要:
            case 2 -> {
                  ^
0_0_39747721_9531\Main.java:45: 错误: 非法的表达式开始
            case 2 -> {
                   ^
0_0_39747721_9531\Main.java:45: 错误: 需要';'
            case 2 -> {
                     ^
0_0_39747721_9531\Main.java:53: 错误: 需要class, interface或enum
        System.out.println(str);
        ^
0_0_39747721_9531\Main.java:54: 错误: 需要class, interface或enum
    }
    ^
15 个错误


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