求大神帮忙看看

[piaolingwuji]

public static void main(String[] args){
System.out.println(getFormatNum("0.000",1.2224));
System.out.println(getFormatNum("0.000",1.2225));
System.out.println(getFormatNum("0.000",1.2226));
System.out.println(getFormatNum("0.000",0.2224));
System.out.println(getFormatNum("0.000",0.2225));
System.out.println(getFormatNum("0.000",0.2226));
System.out.println(getFormatNum("0.000",2.4924));
System.out.println(getFormatNum("0.000",2.4925));
System.out.println(getFormatNum("0.000",2.4926));
}

public static Double getFormatNum(String pattren,Double data){
String reStr = "";
reStr = new java.text.DecimalFormat(pattren).format(data);
return Double.parseDouble(reStr);
}
为什么执行结果会是
1.222
1.222
1.223
0.222
0.223
0.223
2.492
2.493
2.493
当个位为1时并没有按照四舍五入的规则执行

[再不斩]

	  public static Double getFormatNum(String pattren,Double data){
	    String reStr = "";
	    DecimalFormat df = new DecimalFormat(pattren);
	    df.setRoundingMode(RoundingMode.HALF_UP);
	    reStr = df.format(data);    
	    return Double.parseDouble(reStr);
	  }

[piaolingwuji]

更改后执行：
System.out.println(getFormatNum("0.000",1.2225));
System.out.println(getFormatNum("0.000",0.2225));
System.out.println(getFormatNum("0.000",2.4925));
结果依旧是
1.222
0.223
2.493
是否与我的JDK版本有关？我用的是JDK1.6

[再不斩]

	  public static Double getFormatNum(String pattren,Double data){
	    String reStr = "";
	    DecimalFormat df = new DecimalFormat(pattren);
	    df.setRoundingMode(RoundingMode.UP);
	    reStr = df.format(data);    
	    return Double.parseDouble(reStr);
	  }

sorry，参数错了。

[再不斩]

有问题。好像全是1.223了。等会儿啊，再研究研究

[再不斩]

RoundingMode.HALF_UP 我这没问题啊。 刚才输出太多看乱了，现在只保留前三个，没问题。

[习惯纯洁的45度仰望]

reStr = new java.text.DecimalFormat("0").format(data); 结果如下： 1.0 1.0 1.0 0.0 0.0 0.0 2.0 2.0 2.0