Question

i made this calculator program using jsf and a class
i used command buttons to pass and append numbers (like a pocket calculator not first number second number sort of calculator) here is the sample of the code i have a problem with

i want entered values to be appended so for example CLICKING 1 three times gives 111

here the enteredvalue shows as one while the appendedvalue is always the same (1) i have
@ApplicationScoped in the class

<h:inputText value="#{mbcalculator.result}"/>
    <h:commandButton value="1" action="#{mbcalculator.setNumber}">
        <f:setPropertyActionListener target="#{mbcalculator.enteredvalue}"
            value="1" />


       //mbcalculator class

    public String setNumber() {
    appendNumber(enteredvalue);

    return null;
}

public void appendNumber(String x) {
    StringBuffer buffer = new StringBuffer();
    buffer.append(x + "");
    String str = buffer.toString();
    appendedvalue = Integer.parseInt(str);
            result = appendedvalue;


    System.out.println("enter"+enteredvalue);
    System.out.println("append"+appendedvalue);
    System.out.println("result"+result);
}

Answer 1

In the appendNumber() you’re overriding the whole result instead of appending to it.

result = appendedvalue;

Fix it accordingly by really appending to the result.

public void appendNumber(String x) {
    result = Integer.parseInt(result + x);
}