Multiplicar 2 textfield.NUMERIC e colocar na tela

int val1=Integer.parseInt(campo1.getString());
int val2=Integer.parseInt(campo2.getString());

int total=val1*val2;

campo3.setString(Integer.toString(total));

this.consta = new TextField("Constante multiplicadora do x^2:", "", 1, TextField.NUMERIC);
        this.constb = new TextField("Constante multiplicadora do x:", "", ,1 TextField.NUMERIC);

        int a=Integer.parseInt(this.consta.getString());
        int b=Integer.parseInt(this.constb.getString());

        int delta=b*b;

        this.respos.setString(Integer.toString(delta));