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{
 
    int x = 20;
 
    void display(int x)
    {
        System.out.print(x);
        System.out.print(this.x);
    }
 
 
    public static void main(String[] args)
    {
        Test t = new Test();
        t.display(30);
 
    }
 
}
 
 
/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

Main.java:1: error: class, interface, or enum expected
{
^
Main.java:3: error: class, interface, or enum expected
    int x = 20;
    ^
Main.java:3: error: class, interface, or enum expected
    int x = 20;
        ^
Main.java:5: error: class, interface, or enum expected
    void display(int x)
    ^
Main.java:8: error: class, interface, or enum expected
        System.out.print(this.x);
        ^
Main.java:9: error: class, interface, or enum expected
    }
    ^
Main.java:12: error: class, interface, or enum expected
    public static void main(String[] args)
                  ^
Main.java:15: error: class, interface, or enum expected
        t.display(30);
        ^
Main.java:17: error: class, interface, or enum expected
    }
    ^
9 errors

Standard output is empty