描述
这个java.lang.Class.getDeclaringClass() 如果此 Class 对象表示的类或接口是另一个类的成员,则方法返回表示在其中声明它的类的 Class 对象。
如果此类或接口不是任何其他类的成员,则此方法返回 null。如果此 Class 对象表示数组类、原始类型或 void,则此方法返回 null。
声明
以下是声明java.lang.Class.getDeclaringClass()方法
public Class<?> getDeclaringClass()
参数
NA
返回值
此方法返回此类的声明类。
异常
NA
示例
下面的例子展示了 java.lang.Class.getDeclaringClass() 方法的用法。
package com.tutorialspoint;
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());
}
}
}
让我们编译并运行上面的程序,这将产生以下结果——
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
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注:本文由纯净天空筛选整理自 Java.lang.Class.getDeclaringClass() Method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。