e062. getting the superclass of an object.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 14 行

Object o = new String();
    Class sup = o.getClass().getSuperclass();  // java.lang.Object
    
    // Superclass of Object is null
    o = new Object();
    sup = o.getClass().getSuperclass();        // null
    
    // Although the type of o2 is an interface, getSuperclass() returns the object's superclass
    Runnable o2 = new Runnable() {
        public void run() {
        }
    };
    sup = o2.getClass().getSuperclass();       // java.lang.Object