Java中的 Deflater finished()函数及示例

如果已到达压缩数据输出流的末尾，则Java .util.zip中Deflater 类的finished()函数返回 true。

函数签名：

public boolean finished()

句法：

d.finished();

参数：该函数不需要参数

返回类型：该函数返回布尔值，即如果所有输入都被压缩并存储在给定的缓冲区中，则返回 true，否则返回 false。

异常：函数没有抛出任何异常

示例1：演示finished()函数的使用

// Java program to demonstrate
// the use of finished() function
  
import java.util.zip.*;
import java.io.UnsupportedEncodingException;
  
class GFG {
    public static void main(String args[])
        throws UnsupportedEncodingException
    {
        // 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 of finished function
        System.out.println("end of compressed data "
                           + "output stream reached :"
                           + d.finished());
  
        // output bytes
        byte output[] = new byte[1024];
  
        // compress the data
        int size = d.deflate(output);
  
        // compressed String
        System.out.println("Compressed String :"
                           + new String(output)
                           + "\n Size " + size);
  
        // original String
        System.out.println("Original String :" + text
                           + "\n Size " + text.length());
  
        // output of finished function
        System.out.println("end of compressed data "
                           + "output stream reached :"
                           + d.finished());
  
        // end
        d.end();
    }
}

输出：

end of compressed data output stream reached :false
Compressed String :x?sOM?.N?/r???q??
 Size 21
Original String :GeeksforGeeksGeeksforGeeksGeeksforGeeksGeeksforGeeks
 Size 52
end of compressed data output stream reached :true

参考： https: Java/util/zip/Deflater.html#finished()