如果当前字符串的长度为0,则String类的isEmpty()方法返回true。
import java.lang.*; public class StringDemo { public static void main(String[] args) { String str = "nhooo"; //打印字符串的长度 System.out.println("length of string = " + str.length()); //检查字符串是否为空 System.out.println("is this string empty? = " + str.isEmpty()); } }
输出结果
length of string = 14 is this string empty? = false