本文介绍了一种将Java中的double类型转换为String的方法，该方法可以指定小数点后的位数，并避免了使用科学计数法表示数值的情况。通过构造特定的格式模式，确保了数值的准确显示。
1
public String double2String(double d, int fNumber) 
{
2
if (fNumber < 0)
3 fNumber = 0;
4
5 String pattern = null;
6
switch (fNumber) {
7 case 0:
8 pattern = "#0"; //$NON-NLS-1$
9 break;
10 default:
11 pattern = "#0."; //$NON-NLS-1$
12 StringBuffer b = new StringBuffer(pattern);
13 for (int i = 0; i < fNumber; i++) {
14 b.append('#');
15
}
16 pattern = b.toString();
17 break;
18
19 }
20 DecimalFormat formatter = new DecimalFormat();
21 formatter.applyPattern(pattern);
22 String value = formatter.format(d);
23 return value;
24
}
double直接输出时,如果小数点后位数太长会出现字母e,采用本方法转换为string再输出
public String double2String(double d, int fNumber) {2
if (fNumber < 0)3
fNumber = 0;4
5
String pattern = null;6
switch (fNumber) {7
case 0:8
pattern = "#0"; //$NON-NLS-1$9
break;10
default:11
pattern = "#0."; //$NON-NLS-1$12
StringBuffer b = new StringBuffer(pattern);13
for (int i = 0; i < fNumber; i++) {14
b.append('#');15
}16
pattern = b.toString();17
break;18
19
}20
DecimalFormat formatter = new DecimalFormat();21
formatter.applyPattern(pattern);22
String value = formatter.format(d);23
return value;24
}
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