Java 中的平减器 setLevel()函数,示例
原文:https://www . geesforgeks . org/pincer-set level-function-in-Java-with-examples/
在 java.util.zip 中缩减器类的 setLevel() 功能将当前压缩级别设置为指定值。压缩级别是从 0 到 9 的整数值。 功能签名:
public void setLevel(int level)
语法:
d.setLevel(int);
参数:该函数需要一个整数值,它是指定的压缩值
返回类型:函数不返回值。
异常:如果压缩级别无效,函数抛出 IllegalArgumentException。 通货紧缩水平的一些恒定值:
-
最佳 _ 压缩:最佳压缩的压缩级别 最佳 _ 速度:最快压缩的压缩级别。 DEFAULT_COMPRESSION :默认压缩级别。 NO_COMPRESSION* : Compression level for no compression.
例 1:
```java // Java program to describe the use // of setLevel() function
import java.util.zip.*; import java.io.UnsupportedEncodingException;
class GFG {
// Function to compress the string to the given level static void compression(int level, String text) throws UnsupportedEncodingException { // deflater Deflater d = new Deflater(level);
// 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);
// compressed String System.out.println("Compressed String with level =" + level + " :" + new String(output) + "\n Size " + size);
d.end(); }
// Driver code public static void main(String args[]) throws UnsupportedEncodingException {
// get the text String pattern = "GeeksforGeeks", text = "";
// generate the text for (int i = 0; i < 4; i++) text += pattern;
// original String System.out.println("Original String :" + text + "\n Size " + text.length());
// default compression(Deflater.DEFAULT_COMPRESSION, text);
// no compression compression(Deflater.NO_COMPRESSION, text);
// Best compression compression(Deflater.BEST_COMPRESSION, text);
// Best Speed compression(Deflater.BEST_SPEED, text); } } ```
输出:
``java Original String :GeeksforGeeksGeeksforGeeksGeeksforGeeksGeeksforGeeks Size 52 Compressed String with level =-1 :x?sOM?.N?/r???q?? Size 21 Compressed String with level =0 :x4??GeeksforGeeksGeeksforGeeksGeeksforGeeksGeeksforGeeks?? Size 63 Compressed String with level =9 :x?sOM?.N?/r???q?? Size 21 Compressed String with level =1 :xsOM?.N?/r?
?0?? Size 22```
参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/zip/平减器. html#setLevel()
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