Java中的PushbackReader類的ready()方法用于檢查此PushbackReader是否準備就緒。它返回一個布爾值，該值指示閱讀器是否準備就緒。

用法:

public void ready()

參數(shù)：此方法不接受任何參數(shù)

返回值：此方法返回一個布爾值，該值指示此PushbackReader是否準備好被讀取。如果準備就緒，則返回true。否則返回false。

異常：如果輸入輸出時發(fā)生某些錯誤，則此方法將引發(fā)IOException。

下面的方法說明了ready()方法的用法方式：

程序1:

// Java program to demonstrate

// PushbackReader ready() method

import java.io.*;

import java.util.*;

class GFG {

public static void main(String[] args)

{

try {

// Initializing a StringReader

// and PushbackReader

String s = "GeeksForGeeks";

StringReader stringReader

= new StringReader(s);

PushbackReader pushbackReader

= new PushbackReader(stringReader);

// Check if the PushbackReader is

// ready to be read using ready()

System.out.println("Is PushbackReader ready "

+ "to be read: "

+ pushbackReader.ready());

// Close the stream using ready()

pushbackReader.close();

System.out.println("Stream Closed.");

}

catch (Exception e) {

System.out.println(e);

}

}

}

輸出：

Is PushbackReader ready to be read: true

Stream Closed.

程序2:

// Java program to demonstrate

// PushbackReader ready() method

import java.io.*;

import java.util.*;

class GFG {

public static void main(String[] args)

{

try {

// Initializing a StringReader

// and PushbackReader

String s = "GFG";

StringReader stringReader

= new StringReader(s);

PushbackReader pushbackReader

= new PushbackReader(stringReader);

// Check if the PushbackReader is

// ready to be read using ready()

System.out.println("Is PushbackReader ready "

+ "to be read: "

+ pushbackReader.ready());

// Close the stream

pushbackReader.close();

System.out.println("Stream Closed.");

}

catch (Exception e) {

System.out.println(e);

}

}

}

輸出：

Is PushbackReader ready to be read: true

Stream Closed.

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