Java Method類 toGenericString()用法及代碼示例

Method類的java.lang.reflect.Method.toGenericString()方法返回一個字符串，該字符串提供Method的詳細信息，包括該方法的類型參數的詳細信息。

用法:

public String toGenericString()

返回值：此方法返回一個字符串，其中提供了Method的詳細信息，包括該方法的類型參數的詳細信息。

以下示例程序旨在說明Method類的toGenericString()方法：

範例1：

// Program Demonstrate toGenericString() method 
// of Method Class. 
  
import java.lang.reflect.Method; 
  
public class GFG { 
  
    // create another method 
    public final void paint(Object... values) 
    { 
        String message = "A Computer Science portal for geeks"; 
    } 
  
    // create main method 
    public static void main(String args[]) 
    { 
  
        try { 
  
            // get list of declared method objects of class GFG 
            Method[] methods = GFG.class.getMethods(); 
  
            // loop through method list 
            for (Method method:methods) { 
  
                // print only for main and paint methods 
                if (method.getName().equals("main") 
                    || method.getName().equals("paint")) { 
  
                    // print method details using toGenericString() 
                    System.out.println(method.toGenericString()); 
                } 
            } 
        } 
        catch (Exception e) { 
  
            // Print Exception if any Exception occurs 
            e.printStackTrace(); 
        } 
    } 
}

輸出：

public static void GFG.main(java.lang.String[])
public final void GFG.paint(java.lang.Object...)

範例2：

說明：在此方法中，首先創建java.util.concurrent.CountDownLatch類對象。創建java.util.concurrent.CountDownLatch類的類對象後，通過調用類Object的getMethods()創建方法對象的列表。使用toGenericString()遍曆“方法”列表並打印方法詳細信息。

// Program Demonstrate toGenericString() method 
// of Method Class. 
  
import java.lang.reflect.Method; 
import java.util.concurrent.CountDownLatch; 
public class GFG { 
  
    // create main method 
    public static void main(String args[]) 
    { 
  
        try { 
  
            // create class object for class CountDownLatch 
            Class c = CountDownLatch.class; 
  
            // get list of Method object 
            Method[] methods = c.getMethods(); 
  
            System.out.println("Methods of CountDownLatch:"); 
            // Loop through Methods list 
            for (Method m:methods) { 
  
                // Print Method details 
                System.out.println("Method:"
                                   + m.toGenericString()); 
            } 
        } 
        catch (Exception e) { 
            // print Exception is any Exception occurs 
            e.printStackTrace(); 
        } 
    } 
}

輸出：

Methods of CountDownLatch:
Method:public boolean java.util.concurrent.CountDownLatch.await(long,java.util.concurrent.TimeUnit) throws java.lang.InterruptedException
Method:public void java.util.concurrent.CountDownLatch.await() throws java.lang.InterruptedException
Method:public void java.util.concurrent.CountDownLatch.countDown()
Method:public long java.util.concurrent.CountDownLatch.getCount()
Method:public java.lang.String java.util.concurrent.CountDownLatch.toString()
Method:public final void java.lang.Object.wait(long,int) throws java.lang.InterruptedException
Method:public final native void java.lang.Object.wait(long) throws java.lang.InterruptedException
Method:public final void java.lang.Object.wait() throws java.lang.InterruptedException
Method:public boolean java.lang.Object.equals(java.lang.Object)
Method:public native int java.lang.Object.hashCode()
Method:public final native java.lang.Class> java.lang.Object.getClass()
Method:public final native void java.lang.Object.notify()
Method:public final native void java.lang.Object.notifyAll()

說明：該程序的輸出還顯示除CountDownLatch類中定義的方法以外的方法對象的結果，例如wait，equals，toString，hashCode，getClass，notify，notifyAll。這些方法均繼承自java.lang包的超類名稱Object。

toGenericString()和toString()之間的區別

toGenericString()返回描述此方法的字符串，包括其通用類型參數。
toString()返回描述此方法的字符串。
toString()方法不包括泛型類型。

參考：

相關用法

注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 Method Class | toGenericString() method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。