Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.List;

import java.util.Map;

public class Main {
    /**
     * For logging, extremely unnecessary.
     *
     * @param list
     * @return
     */
    public static <T> String list2str(List<T> list) {
        StringBuilder sb = new StringBuilder();
        if (list != null && !list.isEmpty()) {
            sb.append("[");
            for (T t : list) {
                sb.append(t.toString()).append(", ");
            }
            sb.delete(sb.length() - 2, sb.length());
            sb.append("]");
        }
        return sb.toString();
    }

    /**
     * Beware, the valid word "null" is also rendered as empty.
     *
     * @param str
     * @return
     */
    public static boolean isEmpty(String str) {
        return str == null || "".contentEquals(str) || "null".contentEquals(str);
    }

    public static <K, V> boolean isEmpty(Map<K, V> map) {
        return map == null || map.isEmpty();
    }

    public static <T> boolean isEmpty(List<T> l) {
        return l == null || l.isEmpty();
    }
}