[Java知识库]java中double类型转换成字符串并计算小数后面的位数

public class HelloWorld {
? ? public static void main(String []args) {
? ? ? ?//System.out.println("Hello World!");
?? ??? ?//double avgScore = 30.995;
?? ??? ?float avgScore = 30.9;
?? ??? ?String avg = avgScore+"";
?? ??? ?//String[] number = avg.split("\\.");
?? ??? ?
?? ??? ?//System.out.println("值是多少："+number[1]);
?? ??? ?System.out.println("值是多少："+avg);
?? ??? ?String[] ?number = avg.split("\\.");
?? ??? ?System.out.println("后几位是："+number[1]);
?? ??? ?System.out.println("后几位的位数是："+number[1].length());
? ? }
}