如何在Java中使用getDeclaringClass()

2024-05-01 19:53:05 28

该getDeclaringClass()方法返回在其中声明该对象的类的Class对象。仅当Class对象的Class是另一个类的成员时，才会发生这种情况。否则，此方法返回null。

另外，如果Class对象表示原始类型，数组类，void等，则该getDeclaringClass()方法返回null。

演示该getDeclaringClass()方法的程序如下：

示例

package Test;
import java.lang.reflect.*;
public class Demo {
   public static void main(String[] args) {
      Method[] m = String.class.getMethods();
      for(int i = 0; i < m.length; i++) {
         Class decClass = m[i].getDeclaringClass();
         System.out.println("\nThe Method name is: " + m[i].toString());
         System.out.println("The Declaring class name is: " + decClass.toString());
      }
   }
}

输出结果

The Method name is: public boolean java.lang.String.equals(java.lang.Object)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.toString()
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.hashCode()
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.compareTo(java.lang.Object)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.compareTo(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.indexOf(java.lang.String,int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.indexOf(int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.indexOf(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.indexOf(int,int)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(char)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(java.lang.Object)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(boolean)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(char[],int,int)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(char[])
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(double)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(float)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(long)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.valueOf(int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.length()
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.isEmpty()
The Declaring class name is: class java.lang.String

The Method name is: public char java.lang.String.charAt(int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.codePointAt(int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.codePointBefore(int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.codePointCount(int,int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.offsetByCodePoints(int,int)
The Declaring class name is: class java.lang.String

The Method name is: public void java.lang.String.getChars(int,int,char[],int)
The Declaring class name is: class java.lang.String

The Method name is: public byte[] java.lang.String.getBytes()
The Declaring class name is: class java.lang.String

The Method name is: public byte[] java.lang.String.getBytes(java.lang.String) throws java.io.UnsupportedEncodingException
The Declaring class name is: class java.lang.String

The Method name is: public void java.lang.String.getBytes(int,int,byte[],int)
The Declaring class name is: class java.lang.String

The Method name is: public byte[] java.lang.String.getBytes(java.nio.charset.Charset)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.contentEquals(java.lang.StringBuffer)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.contentEquals(java.lang.CharSequence)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.equalsIgnoreCase(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.compareToIgnoreCase(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.regionMatches(int,java.lang.String,int,int)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.regionMatches(boolean,int,java.lang.String,int,int)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.startsWith(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.startsWith(java.lang.String,int)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.endsWith(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.lastIndexOf(int,int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.lastIndexOf(java.lang.String,int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.lastIndexOf(int)
The Declaring class name is: class java.lang.String

The Method name is: public int java.lang.String.lastIndexOf(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.substring(int)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.substring(int,int)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.CharSequence java.lang.String.subSequence(int,int)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.concat(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.replace(char,char)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.replace(java.lang.CharSequence,java.lang.CharSequence)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.matches(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public boolean java.lang.String.contains(java.lang.CharSequence)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.replaceFirst(java.lang.String,java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.replaceAll(java.lang.String,java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String[] java.lang.String.split(java.lang.String,int)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String[] java.lang.String.split(java.lang.String)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.join(java.lang.CharSequence,java.lang.CharSequence[])
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.join(java.lang.CharSequence,java.lang.Iterable)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.toLowerCase(java.util.Locale)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.toLowerCase()
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.toUpperCase()
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.toUpperCase(java.util.Locale)
The Declaring class name is: class java.lang.String

The Method name is: public java.lang.String java.lang.String.trim()
The Declaring class name is: class java.lang.String

The Method name is: public char[] java.lang.String.toCharArray()
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.format(java.util.Locale,java.lang.String,java.lang.Object[])
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.format(java.lang.String,java.lang.Object[])
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.copyValueOf(char[],int,int)
The Declaring class name is: class java.lang.String

The Method name is: public static java.lang.String java.lang.String.copyValueOf(char[])
The Declaring class name is: class java.lang.String

The Method name is: public native java.lang.String java.lang.String.intern()
The Declaring class name is: class java.lang.String

The Method name is: public final void java.lang.Object.wait(long,int) throws java.lang.InterruptedException
The Declaring class name is: class java.lang.Object

The Method name is: public final native void java.lang.Object.wait(long) throws java.lang.InterruptedException
The Declaring class name is: class java.lang.Object

The Method name is: public final void java.lang.Object.wait() throws java.lang.InterruptedException
The Declaring class name is: class java.lang.Object

The Method name is: public final native java.lang.Class java.lang.Object.getClass()
The Declaring class name is: class java.lang.Object

The Method name is: public final native void java.lang.Object.notify()
The Declaring class name is: class java.lang.Object

The Method name is: public final native void java.lang.Object.notifyAll()
The Declaring class name is: class java.lang.Object

The Method name is: public default java.util.stream.IntStream java.lang.CharSequence.codePoints()
The Declaring class name is: interface java.lang.CharSequence

The Method name is: public default java.util.stream.IntStream java.lang.CharSequence.chars()
The Declaring class name is: interface java.lang.CharSequence

如何在Java中使用getDeclaringClass()

示例

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