java装饰着模式实现--字符小写输出_return (c==-1 ? c:character.tolowercase((char)c));-优快云博客

本文链接：https://blog.youkuaiyun.com/fufengrui/article/details/10151601

本文介绍了一个继承FilterInputStream并实现InputStream装饰类的实现方式，具体包括字符转换输入流的创建、方法覆盖及应用实例。

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import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * 继承FilterInputStream，实现InputStream的装饰类
 * 
 * Base Interface:InputStream
 * be decorated: FileInputStream, StringBufferInputStream, ByteArrayInputStream
 * decorator interface: FilterInputStream
 * decorator: PushbackInputStream, BufferedInputStream, DataInputStream, LineNumberInputStream;
 * 
 * @author neu_fufengrui@163.com
 *
 */
public class LowerCaseInputStream extends FilterInputStream{

	protected LowerCaseInputStream(InputStream in) {
		super(in);
	}

	@Override
	public int read() throws IOException {
		int c = super.read();
		return (c == -1 ? c : Character.toLowerCase((char)c));
	}

	@Override
	public int read(byte[] b, int off, int len) throws IOException {
		int result = super.read(b, off, len); 
		for(int i = off; i < off+result; i++){
			b[i] = (byte)Character.toLowerCase((char)b[i]);
		}
		return result;
	}
	
	//测试程序
	public static void main(String[] args) throws IOException{
		int c;
		InputStream in = System.in;
		in = new LowerCaseInputStream(in);
		//循环读取输入内容，读到回车符（13）结束！
		while((c = in.read()) >= 0 && c != 13){
			System.out.print((char)c);
		}
		System.out.println();
		System.out.println("end");
		in.close();
	}

}/*Output

ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
*/