保留四位小数

[java]代码库

package c;
import java.math.*;

public class FuZi {
	public static void main(String[] args) {
		// create 2 BigDecimal Objects
		BigDecimal bg1, bg2;
		bg1 = new BigDecimal("123.126");
		// set scale of bg1 to 6 in bg2
		bg2 = bg1.setScale(4);
		String str = "The value of " +bg1+ " after changing the scale to 6 is" +bg2;
		// print bg2 value
		System.out.println( str );
	}
}