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public class TwoDemo {
public static void main(String[] args) {
// 创建一个整数数组
int[] array = new int[] { 1, 2, 3, 4 };
// 构建一个StringBuilder(可变的字符串序列)
StringBuilder sb = new StringBuilder();
// array.length的长度为4
for (int i = 0; i < array.length - 1; i++) {
sb.append(array[i] + ","); // 程序最后结果为1,2,3,
}
sb.append(array[array.length - 1]); // 将最后一个元素单独加上,解决末尾有","问题
System.out.println(sb); // 结果为:1,2,3,4
}
}
public static String listToIds(List<?> list) {
StringBuilder stringBuilder = new StringBuilder();
for (Object object : list) {
stringBuilder.append(object.toString()).append(",");
}
if (stringBuilder.length() > 0) {
stringBuilder.deleteCharAt(stringBuilder.length() - 1);
}
return stringBuilder.toString();
}
sb.append(array[i]).append(",");