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在我的代码中，只有IF语句被执行，所有其他的ELSE IF语句都没有被执行。请引导。

if (subjectphysics.equalsIgnoreCase("physics")) {

        subject= subjectphysics;
        subjectDisplay.setText("You have selected" + subject);
    }
    else if (subjectchemistry.equalsIgnoreCase("chemistry"))
    {
         subject = subjectchemistry;
        subjectDisplay.setText("You have selected " + subject);
    } else if (subjectgeography.equalsIgnoreCase("geography"))
    {
        subject = subjectgeography;
        subjectDisplay.setText("You have selected " + subject);

    }   else if(subjectbiology.equalsIgnoreCase("biology"))  {
        Toast.makeText(this, " Your enter has entered", Toast.LENGTH_SHORT).show();
        subject= subjectbiology;
        subjectDisplay.setText(" You have selected " + subject);

    }

请指导我如何使完整的代码工作。