Java中printf如何格式化输出

?Java?,????printf????????????????????????:

1. ?????:

int num = 10;
System.out.printf("??:%d\n", num);

2. ??????:

double num = 10.5;
System.out.printf("???:%.2f\n", num);

3. ??????:

String str = "Hello";
System.out.printf("???:%s\n", str);

4. ???????:

int num1 = 10;
double num2 = 10.5;
String str = "Hello";
System.out.printf("??:%d,???:%.2f,???:%s\n", num1, num2, str);

5. ???????????:

int num = 10;
System.out.printf("???5,???:]\n", num);
System.out.printf("???5,???:%-5d\n", num);

???????????????,????printf???????????,????????????