Menggunakan If Lebih dari dua Kondisi pada NetBeans

Code Program Proses :

 private void bprosesActionPerformed(java.awt.event.ActionEvent evt) {                                       
        // TODO add your handling code here:
        String a,b = new String ();
        float c,d,e,f,g;
        a=enim.getText();
        b=enama.getText();
        c=Float.parseFloat(eniab.getText());
        d=Float.parseFloat(enitu.getText());
        e=Float.parseFloat(eniuts.getText());
        f=Float.parseFloat(eniuas.getText());
        g=(c*10/100)+(d*20/100)+(e*30/100)+(f*40/100);
        if((g>=80)&&(g<=100)){
        enian.setText(""+g);
        enihu.setText("A");
        eket.setText("SANGAT MEMUASKAN");
        }
        else if((g>=70)&&(g<=79)){
            enian.setText(""+g);
        enihu.setText("B");
        eket.setText("MEMUASKAN");
        }    
        else if((g>=60)&&(g<=69)){
            enian.setText(""+g);
        enihu.setText("C");
        eket.setText("CUKUP");
        }
        else if((g>=50)&&(g<=59)){
            enian.setText(""+g);
        enihu.setText("D");
        eket.setText("KURANG");
        }
        else if((g>=80)&&(g<=100)){
        enian.setText(""+g);
            enihu.setText("E");
        eket.setText("SANGAT KURANG");
        }
    }