double bigdecimal

import java.math.BigDecimal;public class Test{public static void main(String[] args){String str = "select count(1) from com.aummis.modules.eva.entity.RepYjrepJtglyq  ";System.out.println(str.length());double d = 0.7;d = d + 0.7;d = d + 0.7;d = d + 0.7;d = d + 0.7;d = d + 0.7;d = d + 0.7;d = d + 0.7;d = d + 0.7;d = d + 0.7;System.out.println(d);//7.000000000000001BigDecimal bd = new BigDecimal("0.7");bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));bd = bd.add(new BigDecimal("0.7"));System.out.println(bd);//7.0}}