Here’s a complete code example that demonstrates how to handle null strings before applying the isEmpty() method: public class CheckStringEmpty { public static void main(String[] args) { String str = null; if (isNullOrEmpty(str)) { System.out.println("The string is null or empty."); ...
println("The string is null."); } else { System.out.println("The string is not null."); } Employing the Objects.isNull() method: In Java 8 and later versions, you can use the Objects.isNull() method from the java.util.Objects class to check if a string is null. This method ...
// 判断String是否为null或空 if(myString ==null|| myString.isEmpty) { System.out.println("The string is null or empty."); }else{ System.out.println("The string is not null and not empty. Its value is: "+ myString); } // 注意:如果myString是null,直接调用myString.isEmpty会抛出Nu...
步骤 以下是判断字符串是否为null或为空的步骤: 代码示例 publicclassStringCheck{publicstaticvoidmain(String[]args){Stringstr=null;if(str==null){System.out.println("字符串为空");}elseif(str.isEmpty()){System.out.println("字符串为空");}else{System.out.println("字符串不为空");}}} 1. 2....
publicclassStringCheckExample{publicstaticvoidmain(String[] args){// 定义一个可能为null或空的String变量StringmyString=null;// 我们可以根据需要更改这个变量的值// 判断String是否为null或空if(myString ==null|| myString.isEmpty()) { System.out.println("The string is null or empty."); ...
在Java中,判断一个字符串是否为null或者是空字符串,有以下几种方法: 使用String的isEmpty()方法判断: Stringstr="Hello";if(str!=null&&!str.isEmpty()){System.out.println("String is not null or empty");}else{System.out.println("String is null or empty");} ...
publicclassStringCheckExample{publicstaticvoidmain(String[] args){// 定义一个可能为null或空的String变量StringmyString=null;// 我们可以根据需要更改这个变量的值// 判断String是否为null或空if(myString ==null|| myString.isEmpty()) { System.out.println("The string is null or empty."); ...
百度试题 结果1 题目Java中的String类下列哪个方法是用来判断字符串是否为空? A. isEmpty() B. isBlank() C. isEmpty() D. isNull() 相关知识点: 试题来源: 解析 B 反馈 收藏
在Java中,可以使用`==`运算符或者`Objects.isNull()`方法来检查对象是否为空。1. 使用`==`运算符:```javaObject obj = null;if (o...
*@throwsInvocationTargetException*/publicstaticCheckResultMsg checkObject(Object obj, String[] fileds,booleanisCheckFileds){ CheckResultMsg resultMsg=newCheckResultMsg();if(null==obj){ resultMsg.setSuccess(true); resultMsg.setMassgage("入参对象为NULL");returnresultMsg; ...