我的 BlueJ 在条件语句 if 中运行了错误的行。我的程序是:
import java.io.*;
public class version_check
{
public static void main(String args[])throws IOException
{
BufferedReader read=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter your BlueJ version");
String version=read.readLine();
if(version!="3.1.1")
System.out.println("You need to upgrade your BlueJ version");
else
System.out.println("You have the latest BlueJ version");
}
}
输出屏幕:
Enter your BlueJ version
3.1.1
You need to upgrade your BlueJ version
我犯了什么错误?
最佳答案
使用 .equals 比较字符串。
if(version!="3.1.1")
System.out.println("You need to upgrade your BlueJ version");
到
if(!(version.equals("3.1.1")))
System.out.println("You need to upgrade your BlueJ version");
关于java - BlueJ 字符串条件错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22573095/