How to populate JComboBox on a button event

Question

Hello
I am trying to populate a combobox when the user enters a text in the textfield and clicks a button. On clicking the button the program looks for matching string and if found adds it the combobox.However I cannot get it to work. Here is what my code looks like :
    private void jButton1_actionPerformed(ActionEvent e) {
    String [][] s =new String[2][3];
    s[0][0]="abh123";
    s[0][1]="abh123";
    s[0][2]="abh125";
    s[1][0]="abh125";
    s[1][1]="abh127";
    s[1][2]="abh127";
    String string = jTextField1.getText();
    for(int i=0;i<2;i++){
        for(int j=0;j<3;j++){
            if(string==s[i][j])
            jComboBox1.addItem(string);
            jComboBox1.setSelectedItem(string);
    }Thanks
Abhishek

Answer 1

I figured out the problem but could not understand the reason. Promlem is in if statement. I put in the print command to see the result
          if(s[i][j] != string){   
            System.out.println(string + "  "+ s[i][j]);
            jComboBox1.addItem(s[i][j]);
            jComboBox1.setSelectedItem(s[i][j]);
            }In this case it displays a result which is :
abh123  abh123
abh123  abh123
abh123  abh125
abh123  abh125
abh123  abh127
abh123  abh127but if I change the if statement to
  if(s[i][j] == string){   
            System.out.println(string + "  "+ s[i][j]);
            jComboBox1.addItem(s[i][j]);
            jComboBox1.setSelectedItem(s[i][j]);
            }It does not do anything. It just skips the if statement. Any suggestions
Thanks
Abhishek