donaldlee2008

double num1 = 0.0;

String qq = "19.987";

num1 = Double.valueOf(qq.toString());

 

double num1 =11;

double num1 =21;

String num1 ="";

DecimalFormat df = new DecimalFormat(".00");
num3 = df.format((num1 - num2)/num2*100);

Sytem.out.println(num3);

运行结果:

num3=52.38

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