java test program

test.java

//
// test.java
// Compile: javac test.java
// Run:     java test -t/-b [file name]
//
// env LC_ALL=en javac test.java	:mac

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
 
import java.util.Date;
 
class test
{
	// main
	public static void main( String[] argv ){
		
		System.out.println("test program for Java");
		
		if (argv.length !=2){
			System.out.println("usage: java test -t/-b [file name]");
			System.exit(1);
		}
 
		String s=argv[0];
		if( s.equals("-t") ) {
			// -t スイッチでの動作
			System.out.println("text file");
			// text file write
			fileWrite_txt(argv[1]);
 
			// text file read
			fileRead_txt(argv[1]);
		
		}else if( s.equals("-b") ) {
			// -s スイッチでの動作
			System.out.println("bin file");
 
			// bin file write
			try{
				fileWrite_bin(argv[1]);
			}catch(IOException e){
			      System.out.println(e);
			}
 
			// bin file read
			try{
				fileRead_bin(argv[1]);
			}catch(IOException e){
				System.out.println(e);
			}
			
			// bin test
			test_bin();
			
		}else {
			System.out.println("no such switch");
		}
 
	}
 
	// txt file write
	  private static void fileWrite_txt( String file_w ){
 
		Date date1 = new Date();
 
	  	try{
	    	System.out.println("Write: "+file_w);
	    	
	      File file = new File("test.txt");
 
	      if (checkBeforeWritefile(file)){
	        FileWriter filewriter = new FileWriter(file);
 
	        filewriter.write( date1 + "\r\n");
	        filewriter.write("hello\r\n");
	        filewriter.write("how are you\r\n");
 
	        filewriter.close();
	      }else{
	        System.out.println("can not write");
	      }
	    }catch(IOException e){
	      System.out.println(e);
	    }
	  }
 
	//
	  private static boolean checkBeforeWritefile(File file){
	    if (file.exists()){
	      if (file.isFile() && file.canWrite()){
	        return true;
	      }
	    }
 
	    return false;
	  }
 
	// text file read
	  private static void fileRead_txt( String file_r ){
 
	  	try{
	    	System.out.println("Read: "+file_r);
		  File file = new File("test.txt");
		  FileReader filereader = new FileReader(file);
 
		  int ch = filereader.read();
		  while(ch != -1){
		    System.out.print((char)ch);
 
		    ch = filereader.read();
		  }
		}catch(FileNotFoundException e){
		  System.out.println(e);
		}catch(IOException e){
		  System.out.println(e);
		}
	  }
 
	
	// binary file write
	  private static void fileWrite_bin( String file_w ) throws IOException {
 
	  	System.out.println("Write_bin: "+file_w);
 
	  	FileOutputStream out = new FileOutputStream("test.bin");
        try {
            // 順番にバイナリデータを書き込む
            out.write(0x12);
            out.write(0x34);
            out.write(0x56);
            out.write(0x78);
            out.write(0x9a);
            out.write(0xbc);
            out.write(0xde);
            out.write(0xf0);
		}
	  	finally {
            // try-finally で確実にファイルを閉じる (FileWriter の時と同じ)
            out.close();
        }
 
	  }
 
	// binary file read
	  private static void fileRead_bin( String file_r ) throws IOException {
 
	  	System.out.println("Read_bin: "+file_r);
 
        FileInputStream in = new FileInputStream("test.bin");
        try {
            while (true) {
                // 1 バイトのデータを読み込む
                int b = in.read();
                
                // FileReader 同様、ファイルの終端では -1 が返る
                if (b == -1) {
                    break;
                }
                
                // print (bを16進表記したもの) + " "
                // Integer.toHexString(int) で16進表記に変換できる
                System.out.print(Integer.toHexString(b) + " ");
            }
        }
        finally {
            in.close();
        }

	}
	// test bin
	private static void test_bin(){

		byte[] b = {(byte)0x95,(byte)0x96};

		System.out.println();
		System.out.println("test_bin");

		System.out.printf("%02x", b[0]);
		System.out.println();
		  
	  }	
}