Java中的 Inflater needsInput()函数及示例

Inflater 类的needsInput()函数如果输入数据缓冲区为空则返回 true，否则返回 false，如果输入数据缓冲区为空则调用 setInput()函数提供输入

函数签名：

public boolean needsInput()

句法：

i.needsInput();

参数：该函数不需要参数

返回类型：该函数返回布尔值，即如果输入缓冲区为空则返回true，否则返回false。

异常：函数没有抛出任何异常

示例 1：使用 needsInput()函数

// Java program to describe the use
// of needsInput() function
  
import java.util.zip.*;
import java.io.UnsupportedEncodingException;
  
class GFG {
    public static void main(String args[])
        throws UnsupportedEncodingException,
               DataFormatException
    {
  
        // compress the data
  
        // deflater
        Deflater d = new Deflater();
  
        // get the text
        String pattern = "GeeksforGeeks", text = "";
  
        // generate the text
        for (int i = 0; i < 4; i++)
            text += pattern;
  
        // set the input for deflator
        d.setInput(text.getBytes("UTF-8"));
  
        // finish
        d.finish();
  
        // output bytes
        byte output[] = new byte[1024];
  
        // compress the data
        int size = d.deflate(output);
  
        // end
        d.end();
  
        // end of compression
  
        // use Inflater to get back the original data
  
        // Inflater
        Inflater i = new Inflater();
  
        // does the Inflater need input
        System.out.println("Input Buffer Empty ? :"
                           + i.needsInput());
  
        // set the input for inflator
        i.setInput(output);
  
        // output bytes
        byte inflater_output[] = new byte[1024];
  
        // uncompress the data
        int org_size = i.inflate(inflater_output);
  
        // output of inflater and deflater
        System.out.println("Compressed output of deflater : "
                           + new String(output));
        System.out.println("Compressed output of Inflater : "
                           + new String(inflater_output, "UTF-8"));
  
        // does the Inflater need input
        System.out.println("Input Buffer Empty ? :"
                           + i.needsInput());
  
        // end
        i.end();
    }
}

输出：

参考： https: Java/util/zip/Inflater.html#needsInput()