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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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