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/* 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. */
private class Num {
  private int number1 = 10;
 
  public void Num() { 
    number1 = 100;
  }
 
  public void disp() {
    System.out.println(number1);
  }
}
public class TestP {
  public static void main(String[] args) {
    Num n = new Num();
    n.disp();
  } 
}
 

Main.java:8: error: modifier private not allowed here
private class Num {
        ^
Main.java:19: error: class TestP is public, should be declared in a file named TestP.java
public class TestP {
       ^
2 errors

Standard output is empty