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                ~~~ package exercise; /** * @author virus * @date */ public class ObjectExercise { public static void main(String[] args) { a(null); } public static void a(Object z) { System.out.println("Object"); } public static void a(int z) { System.out.println("Integer"); } public static void a(String z) { System.out.println("String"); } } ~~~ > 打印“String?”。首先,null?在?Java?中不是一個對象,在?Java?中我們可以將?null?賦給任何一個引用類型。而?Java?中的字符串是?Java.lang.String?類的對象。在這里,Java?編譯器會選擇使用最具體的參數類型來調用重載方法。而String類型比Object更為具體,所以會調用method(String?s)方法。
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