how to write a string arraylist on the file using java

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Java

help me to know..how can i write arraylist of string on a file ..

Posted 8-Jan-16 21:46pm

Member 12200805

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Sergey Alexandrovich Kryukov 9-Jan-16 3:50am

What have you tried so far?
What's the problem?
—SA

Member 12200805 9-Jan-16 3:58am

i can able to get the arraylist on the comment prompt..bt dont know how to write that on a file

Member 12200805 9-Jan-16 4:14am

import java.util.ArrayList;
public array {
public static void main(String[] args) {
ArrayList <string> elements = new ArrayList<>();
elements.add( one);
elements.add( two);
elements.add( three);
for (int i = 0; i < elements.size(); i++) {
int value = elements.get(i);
System.out.println("Element: " + value);
}
}
}

Member 12200805 9-Jan-16 4:20am

this is the actual program..i used to get the arraylist..bt want to knw how to get the output on the file...
import java.util.ArrayList;
public class array {
public static void main(String[] args) {

ArrayList <string> elements = new ArrayList<>();
elements.add( one);
elements.add( two);
elements.add( three);
int count = elements.size();
System.out.println( "Count: " + count);
for (int i = 0; i < elements.size(); i++) {
int value = elements.get(i);
System.out.println("Element: " + value);
}
}
}

Maciej Los 9-Jan-16 4:49am

Use 'Reply' widget if you want to be sure that your interlocutor has been informed.

Member 12200805 9-Jan-16 4:51am

sure sir

Maciej Los 9-Jan-16 4:51am

Have you seen this: how to write an array to a file Java - Stack Overflow[^]?

Member 12200805 9-Jan-16 4:55am

thank you..i try to get idea from the link u send..

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Thomas Daniels · Answer 1 · 2016-01-08T22:54:00

You can use a PrintWriter to do this. Note that the following example will overwrite the file if it already exists. If you don't want this, you can use new File("path/to/file.txt").isFile() to check if a file already exists.

Java

import java.io.PrintWriter;

Java

public static void printArrayListToFile(ArrayList<String> arrayList, String filename) throws IOException {
    PrintWriter writer = new PrintWriter(filename);
    for (String line : arrayList) {
        writer.println(line);
    }
    writer.close();
}

You can call this method in your main method like this:

Java

printArrayListToFile(elements, "output.txt");

how to write a string arraylist on the file using java

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