android4.1

### oefening 1 ###

### activity_main.xml ###

<androidx.constraintlayout.widget...>

    <TextView
    	...
        
        android:id="@+id/textView1"
      	
      	... />

</androidx.constraintlayout.widget.ConstraintLayout>

### MainActivity.java ###

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ...

    String varMessage1 = "Java leer je door oefenen";
    TextView myTextView = (TextView)findViewById(R.id.textView1);
    myTextView.setText(varMessage1);

    ...

}

Download hier het bestand.
### oefening 2 ###

### Student.java ###

public class Student {

    String studentNaam;
    int studentNummer;

    public Student(String naamStud, int nummerStud){
        this.studentNaam = naamStud;
        this.studentNummer = nummerStud;
    }

    public String getStudentNaam(){
        return studentNaam;
    }

    public int getStudentNummer(){
        return studentNummer;
    }
}

### MainActivity.java ###

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ...

    Student s = new Student("Jean Luc", 23);

	// String varMessage1 = "Java leer je door oefenen";
    String varMessage1 = s.getStudentNaam();
    
    ...

}

Download hier het bestand.
### oefening 3 ###

### MainActivity.xml ###

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ...

    Student s = new Student("Jean Luc", 23);

	// String varMessage1 = "Java leer je door oefenen";
    String varMessage1 = s.getStudentNaam();
    
    ...

}

Download hier het bestand.