Java中的参数索引
参数索引使程序员可以对输出重新排序。让我们来看一个例子。
示例
public class Demo {
public static void main(String[] args) {
System.out.printf("Before reordering = %s %s %s %s %s %s\n", "one", "two", "three", "four", "five", "six" );
System.out.printf("After reordering = %6$s %5$s %4$s %3$s %2$s %1$s\n","one", "two", "three", "four", "five", "six" );
System.out.printf("Before reordering = %d %d %d\n", 100, 200, 300);
System.out.printf("After reordering = %2$d %3$d %1$d\n", 100, 200, 300);
}
}输出结果
Before reordering = one two three four five six After reordering = six five four three two one Before reordering = 100 200 300 After reordering = 200 300 100
上面，我们已经完全重新排序了输出。订购前，我们正常显示。
System.out.printf("Before reordering = %d %d %d\n", 100, 200, 300);但是，我们更改了顺序并将其显示为-
System.out.printf("After reordering = %2$d %3$d %1$d\n", 100, 200, 300);热门推荐
10 诗词送行祝福语大全简短
11 新房开工吉日祝福语简短
12 50多岁生日简短祝福语
13 安徽疫情祝福语简短英语
14 农民朋友发财祝福语简短
15 对生活祝福语简短精辟
16 搬家词简短祝福语朋友
17 女神结婚快乐祝福语简短
18 文学短句祝福语大全简短