Java Class toString()用法及代碼示例

java.lang.Class類的toString()方法用於將此類的實例轉換為字符串表示形式。此方法返回形成的字符串表示形式。

用法:

public String toString()

參數：此方法不接受任何參數。

返回值：此方法返回此對象的String表示形式。

下麵的程序演示了toString()方法。

示例1:

// Java program to demonstrate toString() method 
  
public class Test { 
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
        // returns the Class object for the class 
        // with the specified name 
        Class c1 = Class.forName("java.lang.String"); 
  
        System.out.print("Class represented by c1: "); 
  
        // toString method on c1 
        System.out.println(c1.toString()); 
    } 
}

輸出：

Class represented by c1: class java.lang.String

示例2:

// Java program to demonstrate toString() method 
  
public class Test { 
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
        // returns the Class object for the class 
        // with the specified name 
        Class c2 = int.class; 
        Class c3 = void.class; 
  
        System.out.print("Class represented by c2: "); 
  
        // toString method on c2 
        System.out.println(c2.toString()); 
  
        System.out.print("Class represented by c3: "); 
  
        // toString method on c3 
        System.out.println(c3.toString()); 
    } 
}

輸出：

Class represented by c2: int
Class represented by c3: void

參考： https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#toString–

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