java中的System.out.format("c1=0x"+"x%",c1)的注释该怎么写？

Question

java中的System.out.format("c1=0x"+"x%",c1)的注释该怎么写？
java中的format用法有哪些啊，什么情况下可以用？

Answer 1

long n = 461012;
System.out.format("%d%n", n); // --> "461012"
System.out.format("%08d%n", n); // --> "00461012"
System.out.format("%+8d%n", n); // --> " +461012"
System.out.format("%,8d%n", n); // --> " 461,012"
System.out.format("%+,8d%n%n", n); // --> "+461,012"

  double pi = Math.PI;
  System.out.format("%f%n", pi);                 //  -->  "3.141593"
  System.out.format("%.3f%n", pi);               //  -->  "3.142"
  System.out.format("%10.3f%n", pi);             //  -->  "     3.142"
  System.out.format("%-10.3f%n", pi);            //  -->  "3.142"
  System.out.format(Locale.FRANCE,
                    "%-10.4f%n%n", pi);          //  -->  "3,1416"
  Calendar c = Calendar.getInstance();
  System.out.format("%tB %te, %tY%n", c, c, c);  //  -->  "May 29, 2006"
  System.out.format("%tl:%tM %tp%n", c, c, c);   //  -->  "2:34 am"
  System.out.format("%tD%n", c);                 //  -->  "05/29/06"