How to make the method name in the class dynamic?

Question

I want to make the method name in the class dynamic when I create a object from the class I want to execute the method name dynamically bellow is my code .

public static void ExecuteTest() throws Exception 
{
    for (int i = 1,  j = 1;  i < 2;  i = i+1, j = j+1)  {    
            FW_ReadExcelFile N = new FW_ReadExcelFile();
            FW_ReadExcelFile.setExcelSheetEnvValues(i,i);
             //java.lang.String Flag2 = N.getTCExecuteFlag() ;

             String Flag = "YES";
             String Flag21 = N.getTCExecuteFlag();


            if ( Flag.equals(Flag21)  ){
                String TCName = N.getTCName();
                FW_Report u = new FW_Report();
                u.TCName; // the FW_Report  class has many methods and I want to call the method on my demand .
            }

Your code style indicates that you're new enough to Java that you *really* shouldn't be attempting reflection yet. — chrylis -cautiouslyoptimistic-, Mar 03 '14 at 09:53
i want to execute the method which is had a "YES" in a local excel sheet and those who had "NO" they shall be ignored . — Muhammed Abu Alzait, Mar 03 '14 at 09:53
A method can't has a "YES" in a local sheet, a method is a piece of code which works on variables. — Smutje, Mar 03 '14 at 09:57

score 1 · Accepted Answer · edited May 23 '17 at 12:20

1

i want to execute the method name dynamically

Use Reflections in Java to achieve this.

Sample code:

        Class<?> name = Class.forName("ClassName");
        Object instance = name.newInstance();
        Method[] methods = name.getMethods();

        for (Method method : methods) {
            if (method.getName().equals(N.getTCName())) {
                // Match found. Invoke the method. call the method on my demand.
                method.invoke(instance, null);
                break;
            }
        }

OR simply try this:

       // Get the method name at runtime
        Method method = ClassName.class.getMethod(N.getTCName(), null);
        method.invoke(new ClassName(), null);

edited May 23 '17 at 12:20

Community

1
1

answered Mar 03 '14 at 09:57

Ankur Shanbhag

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Won't FW_Report u = new FW_Report(); already load the FW_Report class?. I don;t think we need to do Class.forName(); FW_Report.class is enough. – TheLostMind Mar 03 '14 at 10:03
@WhoAmI: Yes thats true. We can already load it as well. – Ankur Shanbhag Mar 03 '14 at 10:09
@AnkurShanbhag: what is the point in foreach loop when you only need Clazz.getMethod(...). – Germann Arlington Mar 03 '14 at 10:29

score 0 · Answer 2 · answered Mar 03 '14 at 09:57

Use java reflection.

java.lang.reflect.Method method = u.getClass().getMethod("getReportName", param1.class, param2.class, ..);

method.invoke(obj,/*param1*/,/*param2*/,....);

getReportName is an example of the method name you want to call. Please refer to java reflection.

How to make the method name in the class dynamic?

2 Answers2