如何優雅的使用Objects.requireNonNull(T obj, String message)定制你的NPE異常

IDEA中習慣跟蹤源碼實現邏輯，多次碰到Objects.requireNonNull(T obj)這個方法，改方法主要用於提早判斷對象是否為空，以便更早的拋出NPE

平時小組開發中強調程序健壯性，不允許組員的代碼中出現明顯的NPE,這樣多數時候都要寫判空邏輯，拋出自定義的異常

我們看下具體的源碼：

/**
 * Checks that the specified object reference is not {@code null}.
 * This method is designed primarily for doing parameter validation in methods
 * and constructors, as demonstrated below:
 * <blockquote><pre>
 * public Foo(Bar bar) {
 *     this.bar = Objects.requireNonNull(bar);
 * }
 * </pre></blockquote>
 *
 * @param obj the object reference to check for nullity
 * @param <T> the type of the reference
 * @return {@code obj} if not {@code null}
 * @throws NullPointerException if {@code obj} is {@code null}
 */
public static <T> T requireNonNull(T obj) {
    if (obj == null)
        throw new NullPointerException();
    return obj;
}
解釋：檢查定義的對象引用不為空。設計該方法主要用來做方法和構造函數中的參數校驗
如上，如果直接使用仍然是拋出一個NPE，除了能提早檢測和拋出異常，無法直接在業務中使用

繼續往下滾動，發現還有這個方法

/**
 * Checks that the specified object reference is not {@code null} and
 * throws a customized {@link NullPointerException} if it is. This method
 * is designed primarily for doing parameter validation in methods and
 * constructors with multiple parameters, as demonstrated below:
 * <blockquote><pre>
 * public Foo(Bar bar, Baz baz) {
 *     this.bar = Objects.requireNonNull(bar, "bar must not be null");
 *     this.baz = Objects.requireNonNull(baz, "baz must not be null");
 * }
 * </pre></blockquote>
 *
 * @param obj     the object reference to check for nullity
 * @param message detail message to be used in the event that a {@code
 *                NullPointerException} is thrown
 * @param <T> the type of the reference
 * @return {@code obj} if not {@code null}
 * @throws NullPointerException if {@code obj} is {@code null}
 */
public static <T> T requireNonNull(T obj, String message) {
    if (obj == null)
        throw new NullPointerException(message);
    return obj;
}

and throws a customized {@link NullPointerException} if it is：定制的空指針異常

and constructors with multiple parameters ：多參數的構造函數

這樣，下次我們想拋出一個自定義的空指針異常的時候,以前是：
if（obj==null）{
　　throw new xxxException("該記錄不存在xxxx");
}

現在可以更優雅的寫Objects.requireNonNull(T obj,"該記錄不存在xxxx")

代碼實現區別不大，那么為啥不選擇優雅^_^