java Intellij error

If I understood your question correctly If you assign values to celsiusButton, fahrenheitButton ,KelvinButtonvariables in only one case then you get error.

Reason why this happens is scope of the object initialization. Below is the sample which illustrates what is happening.

public void example() {
    String str;
    switch (1) {
    case 1:
        str = "test";// If I initalize here then there is problem since
                        // scope is limited to only this case
        str.toString();
        break;

    default:
        str.toString();// Compilation error here.
        break;
    }
}

public void example() {
    String str = "test";
    switch (1) {
    case 1:
        str.toString();
        break;

    default:
        str.toString();// No error because scope of initialisation is whole
                        // method
        break;
    }
}

So you need to define your variables before switch (view.getId()) {

And resultant declaration will look like below

public void onClick(View view) {
RadioButton celsiusButton = (RadioButton) findViewById(R.id.radio0);
RadioButton fahrenheitButton = (RadioButton) findViewById(R.id.radio1);
RadioButton KelvinButton=(RadioButton) findViewById(R.id.radio2);
switch (view.getId()) {
    case R.id.button1:
Answer:1

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