중복제거가 아닌 중복 만들기 ...

GuavaTest1.java

package com.springapp.mvc;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import static com.google.common.base.Preconditions.*;
import static java.lang.System.err;
public class GuavaTest1 {

    private final boolean initialzed = false;

    public void testForNonNullArgument(final String parameter)
    {
        final String localPrameter = checkNotNull(parameter, "null값은"
                + "허용되지 않습니다.");
    }

    public void testDivisorNotZero(final int divisor){
        checkArgument(divisor != 0, "0으로 나눌 수 없습니다.");
    }

    public void testArrayElement(final String[] strArray,
                                 final int indexNumber){
        final int index = checkElementIndex(indexNumber, strArray.length,
                "지정된 Array 요소 위치가 벗어났습니다.");
    }

    public void testarrayPosition(final String[] strarray, final int indexNumber){
        final int index = checkPositionIndex(indexNumber, strarray.length,
                "지정된 Array 요소 위치가 벗어났습니다.");
    }

    public void testState(){
        checkState(this.initialzed, "초기화 되지 않았습니다.");
    }

    public static void printHeader(final String newHeaderText){
        err.println("\n=====================");
        err.println("===" + newHeaderText);
        err.println("=======================");
    }


    public static void main(String[] args) {
        GuavaTest1 testInstance = new GuavaTest1();

        test(new TestCase() {
            @Override
            public void run(Object testInstance, String testName, Object[] parameters) throws InvocationTargetException, IllegalAccessException {
                for (Method each : GuavaTest1.class.getMethods()){

                    if(
                            each.getName().startsWith("test")
                          ||each.getReturnType().equals("void")){
                        //each.
                        if(each.getName().equals(testName)){
                            if(null == parameters){
                                each.invoke(testInstance);
                            }else{
                                each.invoke(testInstance,parameters);
                            }
                        }

                    }
                }
            }
        }, "preconditions.checkNotNull", testInstance, "testArrayElement",new String[]{"Dustin", "java"}, 3);

        test(new TestCase() {
            @Override
            public void run(Object testInstance,String testName, Object[] parameters) throws InvocationTargetException, IllegalAccessException {
                for (Method each : GuavaTest1.class.getMethods()){

                    if(
                            each.getName().startsWith("test")
                                    ||each.getReturnType().equals("void")){
                        //each.
                        if(each.getName().equals(testName)){
                            if(null == parameters){
                                each.invoke(testInstance);
                            }else{
                                each.invoke(testInstance,parameters);
                            }
                        }

                    }
                }
            }
        }, "precondition.checkArgument", testInstance,"testDivisorNotZero",0);

        test(new TestCase() {
            @Override
            public void run(Object testInstance, String testName, Object[] parameters) throws InvocationTargetException, IllegalAccessException {
                for (Method each : GuavaTest1.class.getMethods()){

                    if(
                            each.getName().startsWith("test")
                                    ||each.getReturnType().equals("void")){
                        //each.
                        if(each.getName().equals(testName)){
                            if(null == parameters){
                                each.invoke(testInstance);
                            }else{
                                each.invoke(testInstance,parameters);
                            }
                        }

                    }
                }
            }

        }, "Preconditions.checkElementIndex", testInstance,"testForNonNullArgument",null);

        test(new TestCase() {
            @Override
            public void run(Object testInstance, String testName, Object[] parameters) throws InvocationTargetException, IllegalAccessException {
                for (Method each : GuavaTest1.class.getMethods()){

                    if(
                            each.getName().startsWith("test")
                                    ||each.getReturnType().equals("void")){
                        //each.
                        if(each.getName().equals(testName)){
                            if(null == parameters){
                                each.invoke(testInstance);
                            }else{
                                each.invoke(testInstance,parameters);
                            }
                        }

                    }
                }
            }

        }, "Preconditions.checkPositionIndex", testInstance,"testarrayPosition", new String[]{"Dustin", "java"}, 3);

        test(new TestCase() {
            @Override
            public void run(Object testInstance, String testName, Object[] parmeters) throws InvocationTargetException, IllegalAccessException {
                for (Method each : GuavaTest1.class.getMethods()){

                    if(
                            each.getName().startsWith("test")
                                    ||each.getReturnType().equals("void")){
                        //each.
                        if(each.getName().equals(testName)){
                            if(null == parmeters){
                                each.invoke(testInstance);
                            }else{
                                each.invoke(testInstance,parmeters);
                            }

                        }

                    }
                }
            }

        }, "Preconditions.checkState", testInstance,"testState");
    }

    private static void test(TestCase testcase, String message, Object testInstance, String testName,Object... parameters) {
        printHeader(message);
        try{
           testcase.run(testInstance,testName, parameters);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

}

TestCase.java

package com.springapp.mvc;

import java.lang.reflect.InvocationTargetException;

public interface TestCase {

    void run(Object testInstance, String testName, Object[] parameters) throws InvocationTargetException, IllegalAccessException;
}