实训JAVA语言设计——程序查错

最新推荐文章于 2025-12-01 13:49:36 发布

原创最新推荐文章于 2025-12-01 13:49:36 发布 · 1k 阅读

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本文通过两个示例详细解析了Java中StringBuffer数组的正确初始化方法，避免因未初始化而导致的程序错误。

查错：

1.                               public class WhatHappens {

2.                               public static void main(String[] args) {

3.                                   StringBuffer[] stringBuffers = new StringBuffer[10];

4.                                    for (int i = 0; i < stringBuffers.length; i ++) {

5.                                       stringBuffers[i].append("StringBuffer at index " + i);

6.                                   }

7.                               }

8.                           }

Answer:程序在第定义了数组StringBuffers[]，但在使用数组StringBuffers对象时没有初始化，要初始化后才能使用。如下第5行为对数组对象初始化

1.                           public class ThisHappens {

2.                               public static void main(String[] args) {

3.                                   StringBuffer[] stringBuffers = new StringBuffer[10];

4.                                        for (int i = 0; i < stringBuffers.length; i ++) {

5.                                        stringBuffers[i] = new StringBuffer();

6.                                       stringBuffers[i].append("StringBuffer at index " + i);

7.                                   }

8.                               }

9.                           }