package a;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.*;
import javax.swing.Spring;
public class A
{
public static void main(String[] args)
{
Scanner in=new Scanner(new File("F:\\j.txt"));
}
}
奇怪
有那个文件啊
怎么回事
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.*;
import javax.swing.Spring;
public class A
{
public static void main(String[] args)
{
Scanner in=new Scanner(new File("F:\\j.txt"));
}
}
奇怪
有那个文件啊
怎么回事
try {
Scanner in = new Scanner(new File("E:\\member2.txt"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
try {
Scanner in = new Scanner(new File("F:\\j.txt"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
try {
Scanner in = new Scanner(new File("E:\\member2.txt"));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}这事用try catch 语句捕获异常
还有这个异常应该是 没这个文件吧 你看看你的"E:\\member2.txt 存在嘛
catch (FileNotFoundException e)被提示
执行不到的 FileNotFoundException 的 catch 块。从未从 try 语句主体抛出此异常
in被提示The value of the local variable in is not used
Scanner 这个类的代码贴出来
//导入类
import java.util.Scanner;
import java.io.FileNotFoundException;
import java.io.File;public class Main
{ public static void main(String[] args)
{
try
{
Scanner in = new Scanner(new File("D:\\2.txt"));//确保文件存在
}
catch (FileNotFoundException e)
{
e.printStackTrace();
} }
}
public static void main(String[] args) throws FileNotFoundException
要不就扑捉处理掉
try {
Scanner in = new Scanner(new File("E:\\member2.txt"));
} catch (FileNotFoundException e) {
e.printStackTrace();
我自己的电脑诶
到底怎么回事
跟IDE安装错误会不会有关
import java.util.Scanner;
import java.io.FileNotFoundException;
import java.io.File;public class Main
{ public static void main(String[] args)
{
try
{
File file = new File("D:\\j.txt");
if(file.isDirectory()) {
file.mkdirs();
} else {
if(!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
file.createNewFile();
}
Scanner in = new Scanner(file);
}
catch (Exception e)
{
e.printStackTrace();
} }
}
throws FileNotFoundException