Invoke SET method in Java by given a String-CodePudding

I have a string variable which dependes on "i" variable, i want to call this string, like his method:

String nameSetClassifiedMethod= "setClassficationdesc"   i;

and i wanted something like this:

this.nameSetClassifiedMethod( some parametersIn);

I know this is not possible, because i can't invoke a method with a string like im doing, but i don't know any solutions for this.

I have some code that's whic is not mine, which is doing something like:

if (i == 0) {this.setClassficationdesc0(..)}
if (i == 1) {this.setClassficationdesc1(..)}
if (i == 2) {this.setClassficationdesc2(..)}

So i'm trying to invoke the method by string to reduce complexity

CodePudding user response：

Well you could call the method from a string variable using reflection. But instead, I suggest the following workflow:

String i = "One";

switch (i) {
    case "One":
        // call setClassficationdescOne(...)
        break;

    case "Two":
        // call setClassficationdescTwo(...)
        break;

    // ...
}

CodePudding user response：

It is possible. Please search and read the topic "Reflection in Java". In particular look at class Class and in it look at method getMethod. so you can do:

Method method = this.getClass().getMethod(...);

Once you get the method you can invoke it. (See Javadoc for class Method)

CodePudding user response：

In that case you would use reflection by doing something like the following:

String nameSetClassifiedMethod= "setClassficationdesc"   i;
Method method = Operations.class.getDeclaredMethod("nameSetClassifiedMethod", String.class); //here you should adapt it to your method's signature
method.setAccessible(true);
// and then
ClassWhichHoldsReflectedMethod instance = new ClassWhichHoldsReflectedMethod(); 
method.invoke(instance, params...);

Check this out for more.

CodePudding user response：

Maybe you're looking for Java 14 Switch Expressions:

int i = // initilizing the variable
    
switch (i) {
    case 0 -> this.setClassficationdesc0(..);
    case 1 -> this.setClassficationdesc1(..);
    case 2 -> this.setClassficationdesc2(..);
}