1.System.out.printfdouble num 3.1415926;System.out.printf(%.2f, num);System.out.printf(%.4f, num);2.String.format 搭配 printlndouble a 2.3333;String s String.format(%.2f, a);System.out.println(s);
double保留小数点
1.System.out.printfdouble num 3.1415926;System.out.printf(%.2f, num);System.out.printf(%.4f, num);2.String.format 搭配 printlndouble a 2.3333;String s String.format(%.2f, a);System.out.println(s);
