How to write an if construct in java

User Interface:

Code written on the event of Check age Button:

int age;

age=Integer.parseInt(jTextField1.getText());

if(age<=0)

{

    jLabel2.setText("ERROR");

}

else

{

    if(age>0 && age<=50 )

    {

        jLabel2.setText("Young Age");

    }

    else

    {

        jLabel2.setText("Old Age");

    }

}