AP计算机教程5-4：常见错误
- 忘记在
while循环中变更循环条件所涉及的变量，造成无限循环。public class Test { public static void main(String[] args) { int x = 3; while (x > 0) { System.out.println(x); } } } - 弄错
for循环的开始和结束条件，这往往会导致读取某个数组或字符串长度以外的元素或字符，造成out of bounds error。public class Test { public static void main(String[] args) { String result = ""; String message = "watch out"; int pos = 0; while (pos < message.length()) { result = result + message.substring(pos,pos+2); pos = pos + 1; } System.out.println(result); } } - 在循环中（不正确的）使用
return语句，造成循环提前结束。public class Test { public static boolean isInOrder(String check) { int pos = 0; while (pos < check.length() - 1) { if (check.substring(pos, pos+1).compareTo(check.substring(pos+1, pos+2)) < 0) return true; pos++; } return false; } public static void main(String[] args) { System.out.println(isInOrder("abca")); System.out.println(isInOrder("abc")); } }
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