可以利用NumberFormat对输出结果进行自定义的格式控制,给你贴个代码最后保留小数点后两位 import java.text.NumberFormat; import java.text.DecimalFormat; public class NumberFormatDemo { public static void main(String[] args){ NumberFormat nf=new DecimalFormat(".00"); double d=1500.0; String s=nf.format(d); System.out.println(s); } }
自己格式化一下 for example double d = 1000.00; System.out.printf("%.2f\n", d); String s = String.format("%.2f", d); System.out.println(s);或者用 DecimalFormat 格式化
public static double round(double v, int scale) { if (scale < 0) { throw new IllegalArgumentException( "The scale must be a positive integer or zero"); } BigDecimal b = new BigDecimal(Double.toString(v)); BigDecimal one = new BigDecimal("1"); return b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doubleValue(); }这个方法很好
不好意思,因为我不方便把源代码放上来,所以有些地方删了或改了,因为从来没学过编程,我只想想请教下如何能显示出来的是0.00这样的类型。谢谢 public class Buyer { private double money;
public Buyer() {money = setBalance(); System.out.println(toString()); }
import java.text.NumberFormat;
import java.text.DecimalFormat;
public class NumberFormatDemo {
public static void main(String[] args){
NumberFormat nf=new DecimalFormat(".00");
double d=1500.0;
String s=nf.format(d);
System.out.println(s);
}
}
for example
double d = 1000.00;
System.out.printf("%.2f\n", d);
String s = String.format("%.2f", d);
System.out.println(s);或者用 DecimalFormat 格式化
public static double round(double v, int scale) {
if (scale < 0) {
throw new IllegalArgumentException(
"The scale must be a positive integer or zero");
}
BigDecimal b = new BigDecimal(Double.toString(v));
BigDecimal one = new BigDecimal("1");
return b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
}这个方法很好
public class Buyer
{ private double money;
public Buyer()
{money = setBalance();
System.out.println(toString());
}
private double setBalance()
{
System.out.print("The balance has: " );
return In.nextDouble();}
public double money()
{ return money;}
public String toString()
{ String abc = people();
return abc;}
public String people()
{ return " has " + money;}
}
public String people()
{ return String.format(" has %.2f", money);}