Java Deflater finished()用法及代碼示例

如果已到達壓縮數據輸出流的末尾，則java.util.zip中Deflater類的finished()函數將返回true。

函數簽名：

public boolean finished()

用法:

d.finished();

參數：該函數不需要參數

返回類型：該函數返回布爾值，即如果所有輸入都已壓縮並存儲在給定的緩衝區中，則為true，否則為false。

異常：該函數不會引發任何異常

範例1：演示使用finished()函數

// 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(); 
    } 
}

輸出：

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

參考： https://docs.oracle.com/javase/7/docs/api/java/util/zip/Deflater.html#finished()

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