[JAVA] float,double大数据不要科学计数方法显示

前言：理论

实践

long l1 = 1234567l;
long l2 = 12345678l;
long l3 = 123456789l;

double f1 = 1234567f;
double f2 = 12345678f;
double f3 = 123456789f;

double d1 = 1234567.123d;
double d2 = 12345678.123d;
double d3 = 123456789.123d;

System.out.println("******* long *******");
System.out.println(l1);
System.out.println(l2);
System.out.println(l3);

System.out.println("******* float *******");
System.out.println(f1);
System.out.println(f2);
System.out.println(f3);

System.out.println("******* double *******");
System.out.println(d1);
System.out.println(d2);
System.out.println(d3);

******* long *******
1234567
12345678
123456789
******* float *******
1234567.0
1.2345678E7
1.23456792E8
******* double *******
1234567.123
1.2345678123E7
1.23456789123E8

怎么让float,double大数据在前端不以科学计数方法显示？

public static void main(String[] args) {
double d = 123456789.128d;
String s1 = big(d);
String s2 = big2(d);
System.out.println(d);
System.out.println(s1);
System.out.println(s2);
}

// 方法一：NumberFormat
private static String big(double d) {
NumberFormat nf = NumberFormat.getInstance();
// 是否以逗号隔开, 默认true以逗号隔开,如[123,456,789.128]
nf.setGroupingUsed(false);
// 结果未做任何处理
return nf.format(d);
}

//方法二： BigDecimal
private static String big2(double d) {
BigDecimal d1 = new BigDecimal(Double.toString(d));
BigDecimal d2 = new BigDecimal(Integer.toString(1));
// 四舍五入,保留2位小数
return d1.divide(d2,2,BigDecimal.ROUND_HALF_UP).toString();
}

1.23456789128E8
123,456,789.128
123456789.13