Java String getBytes() 方法示例 Java test String is null or empty Java String format() 方法示例. Java String getBytes() 方法示例 import java.lang.*; public class StringDemo { public static void main(String[] args) { try { String str1 = "admin"; System.out.println("string1 = " + str1); //copy the contents of the String to a byte array byte[] arr = str1.getBytes(); String str2 = new String(arr); //print the contents of the byte array System.out.println("new string = " + str2); } catch(Exception e) { System.out.print(e.toString()); } } } Java test String is null or empty Java String format() 方法示例.