Java中的类 toString() 方法及示例

Java.lang.Class 类的toString()方法用于将此类的实例转换为字符串表示形式。此方法返回形成的字符串表示。

句法：

public String toString()

参数：此方法不接受任何参数。

返回值：此方法返回此对象的字符串表示形式。

下面的程序演示了 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());
    }
}

输出：

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());
    }
}

输出：

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

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