Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;

public class Main {

    public static int size(Object object) {
        if (object == null) {
            return 0;
        }

        int total = 0;
        if (object instanceof Map) {
            total = ((Map) object).size();
        } else if (object instanceof Collection) {
            total = ((Collection) object).size();
        } else if (object instanceof Object[]) {
            total = ((Object[]) object).length;
        } else if (object instanceof Iterator) {
            Iterator it = (Iterator) object;
            while (it.hasNext()) {
                total++;
                it.next();
            }
        } else if (object instanceof Enumeration) {
            Enumeration it = (Enumeration) object;
            while (it.hasMoreElements()) {
                total++;
                it.nextElement();
            }
        } else {
            try {
                total = Array.getLength(object);
            } catch (IllegalArgumentException ex) {
                throw new IllegalArgumentException("Unsupported object type: " + object.getClass().getName());
            }
        }

        return total;
    }
}