public class TestDouble { 

public static void main(String[] args) { 

double d =538.8; 

System.out.println(d*100); 

}

public class TestDouble { 
  public static void main(String[] args) { 
   double d =538.8;   
   BigDecimal a1 = new BigDecimal(Double.toString(d)); 
   BigDecimal b1 = new BigDecimal(Double.toString(100));  
   BigDecimal result = a1.multiply(b1);// 相乘结果 
   System.out.println(result); 
   BigDecimal one = new BigDecimal("1"); 
   double a = result.divide(one,2,BigDecimal.ROUND_HALF_UP).doubleValue();//保留1位数 
   System.out.println(a); 
  } 
}