How to make checkbox visible only after the first checkbox is checked

Am still a learner in android, please am trying to do the following in android. I want my checkbox to show my other checkbox only after I have click the first checkbox, but if the first is unchecked the rest should be invisible. For example Class 1: checkbox, should only show Class 2:checkbox only when Class 1: checked has been selected and so on for the rest checkbox. Please find my code below. Am willing to accept answer immediately once it works

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

    switch (buttonView.getId()) {
        case R.id.chk_clas1:
            //do stuff
            if (chk_clas1.isChecked()) {
                if(c1.equals("0")){adddate(txt_clas1);}
                clas="1";
                fdate=txt_clas1.getText().toString();



            } else {
                txt_clas1.setText("");


            }
            break;
        case R.id.chk_clas2:
            //do stuff

            if (chk_clas2.isChecked()) {
                if(c2.equals("0")) {adddate(txt_clas2);}
                clas="2";
                fdate=txt_clas2.getText().toString();

            } else {
                txt_clas2.setText("");

            }

            break;
        case R.id.chk_clas3:
            //do stuff
            if (chk_clas3.isChecked()) {
                if(c3.equals("0")){
                adddate(txt_clas3);}
                clas="3";
                fdate=txt_clas3.getText().toString();
            } else {
                txt_clas3.setText("");

            }

            break;
        case R.id.chk_clas4:
            //do stuff
            if (chk_clas4.isChecked()) {
                if(c4.equals("0")){
                adddate(txt_clas4);}
                clas="4";
                fdate=txt_clas4.getText().toString();
            } else {
                txt_clas4.setText("");

            }

            break;
        case R.id.chk_clas5:
            //do stuff
            if (chk_clas5.isChecked()) {
                if(c5.equals("0")){
                adddate(txt_clas5);}
                clas="5";
                fdate=txt_clas5.getText().toString();
            } else {
                txt_clas5.setText("");

            }

            break;
        case R.id.chk_clas6:
            //do stuff
            if (chk_clas6.isChecked()) {
                if(c6.equals("0")){
                adddate(txt_clas6);}
                clas="6";
                fdate=txt_clas6.getText().toString();
            } else {
                txt_clas6.setText("");

            }

            break;

        case R.id.chk_service1:
            //do stuff
            if (chk_service1.isChecked()) {
                if(s1.equals("0")){
                adddate(txt_service1);}
                sday="1";
                sdate=txt_service1.getText().toString();
            } else {
                txt_service1.setText("");
            }

            break;

        case R.id.chk_service2:
            //do stuff
            if (chk_service2.isChecked()) {
                if(s2.equals("0")){
                adddate(txt_service2);}
                sday="2";
                sdate=txt_service2.getText().toString();
            } else {
                txt_service2.setText("");
            }

            break;

        case R.id.chk_service3:
            //do stuff
            if (chk_service3.isChecked()) {
                if(s3.equals("0")){
                adddate(txt_service3);}
                sday="3";
                sdate=txt_service3.getText().toString();
            } else {
                txt_service3.setText("");
            }

            break;

        case R.id.chk_service4:
            //do stuff
            if (chk_service4.isChecked()) {
                if(s4.equals("0")){
                adddate(txt_service4);}
                sday="4";
                sdate=txt_service4.getText().toString();
            } else {
                txt_service4.setText("");
            }

            break;