java.lang.Class.getDeclaringClass()方法實例

java.lang.Class.getDeclaringClass() 方法返回表示在它被聲明的類的Class對象，如果此Class對象所表示的類或接口是另一個類成員。

如果這個類或接口不屬於任何其他類成員此方法返回null。如果此Class對象表示一個數組類，基本類型或void，則此方法返回null。

聲明

以下是**java.lang.Class.getDeclaringClass()**方法的聲明

public Class<?> getDeclaringClass()

參數

• NA

返回值

此方法返回這個類的類聲明。

異常

• NA

例子

下面的例子顯示java.lang.Class.getDeclaringClass()方法的使用。

package com.yiibai; import java.lang.reflect.*; public class ClassDemo { public static void main(String[] args) { // class object associated with class Long Class cls = Long.class; Method[] m = cls.getMethods(); for(int i = 0; i < m.length; i++) { // returns te declaring class Class dec = m[i].getDeclaringClass(); // displays all methods System.out.println("Method = " + m[i].toString()); System.out.println(" Declaring class: " + dec.toString()); } } }

讓我們來編譯和運行上面的程序，這將產生以下結果：

Method = public static int java.lang.Long.numberOfLeadingZeros(long) Declaring class: class java.lang.Long Method = public static int java.lang.Long.numberOfTrailingZeros(long) Declaring class: class java.lang.Long Method = public static int java.lang.Long.bitCount(long) Declaring class: class java.lang.Long Method = public boolean java.lang.Long.equals(java.lang.Object) Declaring class: class java.lang.Long Method = public static java.lang.String java.lang.Long.toString(long,int) Declaring class: class java.lang.Long Method = public static java.lang.String java.lang.Long.toString(long) Declaring class: class java.lang.Long Method = public java.lang.String java.lang.Long.toString() Declaring class: class java.lang.Long Method = public int java.lang.Long.hashCode() Declaring class: class java.lang.Long Method = public static long java.lang.Long.reverseBytes(long) Declaring class: class java.lang.Long Method = public int java.lang.Long.compareTo(java.lang.Long) Declaring class: class java.lang.Long Method = public int java.lang.Long.compareTo(java.lang.Object) Declaring class: class java.lang.Long Method = public static java.lang.Long java.lang.Long.getLong(java.lang.String) Declaring class: class java.lang.Long Method = public static java.lang.Long java.lang.Long.getLong(java.lang.String,long) Declaring class: class java.lang.Long Method = public static java.lang.Long java.lang.Long.getLong(java.lang.String,java.lang.Long) Declaring class: class java.lang.Long Method = public byte java.lang.Long.byteValue() Declaring class: class java.lang.Long Method = public short java.lang.Long.shortValue() Declaring class: class java.lang.Long Method = public int java.lang.Long.intValue() Declaring class: class java.lang.Long Method = public long java.lang.Long.longValue() Declaring class: class java.lang.Long Method = public float java.lang.Long.floatValue() Declaring class: class java.lang.Long Method = public double java.lang.Long.doubleValue() Declaring class: class java.lang.Long Method = public static java.lang.Long java.lang.Long.valueOf(java.lang.String,int) throws java.lang.NumberFormatException Declaring class: class java.lang.Long Method = public static java.lang.Long java.lang.Long.valueOf(java.lang.String) throws java.lang.NumberFormatException Declaring class: class java.lang.Long Method = public static java.lang.Long java.lang.Long.valueOf(long) Declaring class: class java.lang.Long Method = public static java.lang.String java.lang.Long.toHexString(long) Declaring class: class java.lang.Long Method = public static java.lang.Long java.lang.Long.decode(java.lang.String) throws java.lang.NumberFormatException Declaring class: class java.lang.Long Method = public static long java.lang.Long.reverse(long) Declaring class: class java.lang.Long Method = public static java.lang.String java.lang.Long.toOctalString(long) Declaring class: class java.lang.Long Method = public static java.lang.String java.lang.Long.toBinaryString(long) Declaring class: class java.lang.Long Method = public static long java.lang.Long.highestOneBit(long) Declaring class: class java.lang.Long Method = public static long java.lang.Long.lowestOneBit(long) Declaring class: class java.lang.Long Method = public static long java.lang.Long.rotateLeft(long,int) Declaring class: class java.lang.Long Method = public static long java.lang.Long.rotateRight(long,int) Declaring class: class java.lang.Long Method = public static int java.lang.Long.signum(long) Declaring class: class java.lang.Long Method = public static long java.lang.Long.parseLong(java.lang.String,int) throws java.lang.NumberFormatException Declaring class: class java.lang.Long Method = public static long java.lang.Long.parseLong(java.lang.String) throws java.lang.NumberFormatException Declaring class: class java.lang.Long Method = public final native void java.lang.Object.wait(long) throws java.lang.InterruptedException Declaring class: class java.lang.Object Method = public final void java.lang.Object.wait(long,int) throws java.lang.InterruptedException Declaring class: class java.lang.Object Method = public final void java.lang.Object.wait() throws java.lang.InterruptedException Declaring class: class java.lang.Object Method = public final native java.lang.Class java.lang.Object.getClass() Declaring class: class java.lang.Object Method = public final native void java.lang.Object.notify() Declaring class: class java.lang.Object Method = public final native void java.lang.Object.notifyAll() Declaring class: class java.lang.Object