What is the low level mechanism for switch statements? [duplicate]

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I am interested in how switch statements in languages work and if there is any difference to using a string of if-else cases. Is there any difference in the underlying workings (with respect to Assembly code) of those or is it just to make it easier to read?

For example:

public void processInput(int num){
        case 1:
        //process case 1
        case 2:
        //process case 2

Source: java

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