Question

Is there any alternative way to implement a switch case in Java other than if else which is not looking good. A set of values will be there in combination, according to the selection corresponding method has to be executed.

Answer 1

Presumably you’re struggling with the requirement of case’s being constant. Typically this is a code-smell, but there are things you can do. You might want to raise and link to another question that details why you’re trying to switch.

Map<String,Object> map = new HasMap<String,Object>();
// ... insert stuff into map
// eg: map.add("something", new MyObject());

String key = "something";
if (map.contains(key)) {
    Object o = map.get(key);
}

In the example above, you might want to map to ‘handlers’, something like

interface Handler {
    public void doSomething();
}

which then makes this all turn into a lookup.

if (map.contains(key)) { map.get(key).doSomething(); }

Again, it’s a bit of a smell, so please post a question which illustrates the reasoning.