printwriter Java,java PrintWriter无法解析

printwriter Java,java PrintWriter无法解析IhavenoideawhyIgetthemessage”cannotberesolved”onoutineclipseonthe11thlineimportjava.io.*;publicclassdriver{publicstaticvoidmain(String[]args){try{PrintWriterout=newPri…

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printwriter Java,java PrintWriter无法解析

I have no idea why I get the message “cannot be resolved” on out in eclipse on the 11th line

import java.io.*;

public class driver {

public static void main(String[] args) {

try {

PrintWriter out = new PrintWriter(“output.txt”);

}

catch (FileNotFoundException e) {

System.out.print(“file not found”);

e.printStackTrace();

}

out.print(“hello”);

out.close();

}

}

OK so now I have this

import java.io.*;

public class driver {

public static void main(String[] args) {

PrintWriter out = null;

try {

out = new PrintWriter(“output.txt”);

}

catch (FileNotFoundException e) {

System.out.print(“file not found”);

e.printStackTrace();

}

out.print(“hello”);

out.close();

}

}

Why doesn’t eclipse create a file once I close out?

解决方案

You can also use new try-with-resource block introduced in JDK 1.7, in this advantage is you don’t need to worry about closing any resource which implements Closable Interface.

Then code will look like this:

try (PrintWriter out = new PrintWriter(“output.txt”))

{

out.print(“hello”);

}

catch (FileNotFoundException e)

{

System.out.print(“file not found”);

e.printStackTrace();

}

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