float ft = 134.3435f; int scale = 2;//设置位数 int roundingMode = 4;//表示四舍五入,可以选择其他舍值方式,例如去尾,等等. BigDecimal bd = new BigDecimal((double)ft); bd = bd.setScale(scale,roundingMode); ft = bd.floatValue();
有个更简单的方法: import java.text.DecimalFormat;String a = new DecimalFormat("###,###,###.##").format(100.12345 );
a='100.12'
float a = 123.2334f; float b = (float)(Math.round(a*100))/100; System.out.println("b="+b);
int scale = 2;//设置位数
int roundingMode = 4;//表示四舍五入,可以选择其他舍值方式,例如去尾,等等.
BigDecimal bd = new BigDecimal((double)ft);
bd = bd.setScale(scale,roundingMode);
ft = bd.floatValue();
import java.text.DecimalFormat;String a = new DecimalFormat("###,###,###.##").format(100.12345 );
a='100.12'
float b = (float)(Math.round(a*100))/100;
System.out.println("b="+b);