极客教程Java Writer toString()方法及示例
Java中 Writer 类的 toString() 方法是用来获取这个Writer实例的字符串表示。这个方法不接受任何参数，并返回所需的字符串值。
语法
public String toString()
参数： 该方法不接受任何参数。
返回值： 该方法返回 一个字符串值 ，即Writer实例的字符串表示。
下面的方法说明了toString()方法的工作。
程序 1 :
// Java program to demonstrate
// Writer toString() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a Writer instance
Writer writer
= new PrintWriter(System.out);
// Get the String
// to be written in the stream
String string = "GeeksForGeeks";
// Write the string
// to this writer using write() method
writer.write(string);
System.out.println("String representation: "
+ writer.toString());
}
catch (Exception e) {
System.out.println(e);
}
}
}Java
输出
String representation: java.io.PrintWriter@232204a1Java
程序2
// Java program to demonstrate
// Writer toString() method
import java.io.*;
class GFG {
public static void main(String[] args)
{
try {
// Create a Writer instance
Writer writer
= new PrintWriter(System.out);
// Get the String
// to be written in the stream
String string = "GFG";
// Write the string
// to this writer using write() method
writer.write(string);
System.out.println("String representation: "
+ writer.toString());
}
catch (Exception e) {
System.out.println(e);
}
}
}Java
输出
String representation: java.io.PrintWriter@232204a1Java