Example usage for java.lang String String

List of usage examples for java.lang String String

Introduction

In this page you can find the example usage for java.lang String String.

Prototype

public String(StringBuilder builder) 

Source Link

Document

Allocates a new string that contains the sequence of characters currently contained in the string builder argument.

Usage

From source file:base64test.Base64Test.java

/**
 * @param args the command line arguments
 *///w w  w .  j  a  va 2 s . co  m
public static void main(String[] args) {
    try {
        if (!Base64.isBase64(args[0])) {
            throw new Exception("Arg 1 is not a Base64 string!");
        } else {
            String decodedBase64String = new String(Base64.decodeBase64(args[0]));
            File tempFile = File.createTempFile("base64Test", ".tmp");
            tempFile.deleteOnExit();
            FileWriter fw = new FileWriter(tempFile, false);
            PrintWriter pw = new PrintWriter(fw);
            pw.write(decodedBase64String);
            pw.close();
            String fileType = getFileType(tempFile.toPath());
            System.out.println(fileType);
            System.in.read();
        }
    } catch (Exception e) {
        System.err.println(e.getMessage());
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {

    String s = "Hello World from java2s.com";

    FileOutputStream out = new FileOutputStream("test.txt");
    ObjectOutputStream oout = new ObjectOutputStream(out);

    // write something in the file
    oout.writeUTF(s);// w w w . ja v  a 2  s .c o  m
    oout.flush();
    oout.close();
    // create an ObjectInputStream for the file we created before
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt"));

    // read and print from index 0 to 7
    byte[] b = new byte[13];
    ois.readFully(b, 0, 7);
    String array = new String(b);
    System.out.println(array);
    ois.close();

}

From source file:Main.java

public static void main(final String[] args) {
    ConcurrentHashMap<Integer, UUID> concurrentHashMap = new ConcurrentHashMap<>();

    for (int i = 0; i < 100; i++) {
        concurrentHashMap.put(i, UUID.randomUUID());
    }//from  w  ww  .j  a v a2  s.  co m

    int threshold = 1;

    concurrentHashMap.forEachValue(threshold, System.out::println);

    concurrentHashMap.forEach((id, uuid) -> {
        if (id % 10 == 0) {
            System.out.println(String.format("%s: %s", id, uuid));
        }
    });

    String searchResult = concurrentHashMap.search(threshold, (id, uuid) -> {
        if (String.valueOf(uuid).contains(String.valueOf(id))) {
            return new String(id + ":" + uuid);
        }
        return null;
    });

    System.out.println(searchResult);
}

From source file:FileIOApp.java

public static void main(String args[]) throws IOException {
    FileOutputStream outStream = new FileOutputStream("test.txt");
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));/*from   ww w .jav a  2  s  .com*/
    outStream.close();
    FileInputStream inStream = new FileInputStream("test.txt");
    int inBytes = inStream.available();
    System.out.println("inStream has " + inBytes + " available bytes");
    byte inBuf[] = new byte[inBytes];
    int bytesRead = inStream.read(inBuf, 0, inBytes);
    System.out.println(bytesRead + " bytes were read");
    System.out.println("They are: " + new String(inBuf));
    inStream.close();
    File f = new File("test.txt");
    f.delete();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    DatagramChannel server = null;
    server = DatagramChannel.open();
    InetSocketAddress sAddr = new InetSocketAddress("localhost", 8989);
    server.bind(sAddr);/*  ww w.  j a  va  2  s . c  om*/
    ByteBuffer buffer = ByteBuffer.allocate(1024);

    while (true) {
        System.out.println("Waiting for a  message  from" + "  a  remote  host at " + sAddr);
        SocketAddress remoteAddr = server.receive(buffer);
        buffer.flip();
        int limits = buffer.limit();
        byte bytes[] = new byte[limits];
        buffer.get(bytes, 0, limits);
        String msg = new String(bytes);

        System.out.println("Client at " + remoteAddr + "  says: " + msg);
        buffer.rewind();
        server.send(buffer, remoteAddr);
        buffer.clear();
    }
    //server.close();
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    File file = new File("c:\\a.bat");
    InputStream is = new FileInputStream(file);

    long length = file.length();
    if (length > Integer.MAX_VALUE) {
        System.out.println("File is too large");
    }/*from  w  w  w. j  ava 2s.  c om*/

    byte[] bytes = new byte[(int) length];

    int offset = 0;
    int numRead = 0;
    while (numRead >= 0) {
        numRead = is.read(bytes, offset, bytes.length - offset);
        offset += numRead;
    }

    if (offset < bytes.length) {
        throw new IOException("Could not completely read file " + file.getName());
    }
    is.close();
    System.out.println(new String(bytes));
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    ZipFile zip = new ZipFile(new File("sample.zip"));

    for (Enumeration e = zip.entries(); e.hasMoreElements();) {
        ZipEntry entry = (ZipEntry) e.nextElement();
        System.out.println("File name: " + entry.getName() + "; size: " + entry.getSize()
                + "; compressed size: " + entry.getCompressedSize());
        InputStream is = zip.getInputStream(entry);
        InputStreamReader isr = new InputStreamReader(is);

        char[] buffer = new char[1024];
        while (isr.read(buffer, 0, buffer.length) != -1) {
            String s = new String(buffer);
            System.out.println(s.trim());
        }/*w w  w .j  ava2s  .c o m*/
    }
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    KeyGenerator keyGenerator = KeyGenerator.getInstance("Blowfish");
    keyGenerator.init(128);//from  ww w .  j a v  a 2 s .  com
    Key blowfishKey = keyGenerator.generateKey();

    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
    keyPairGenerator.initialize(1024);
    KeyPair keyPair = keyPairGenerator.genKeyPair();

    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic());

    byte[] blowfishKeyBytes = blowfishKey.getEncoded();
    System.out.println(new String(blowfishKeyBytes));
    byte[] cipherText = cipher.doFinal(blowfishKeyBytes);
    System.out.println(new String(cipherText));
    cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());

    byte[] decryptedKeyBytes = cipher.doFinal(cipherText);
    System.out.println(new String(decryptedKeyBytes));
    SecretKey newBlowfishKey = new SecretKeySpec(decryptedKeyBytes, "Blowfish");
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    byte[] input = "www.java2s.com".getBytes();
    byte[] keyBytes = new byte[] { 0x01, 0x23, 0x45, 0x67, (byte) 0x89, (byte) 0xab, (byte) 0xcd, (byte) 0xef };
    byte[] ivBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x00, 0x00, 0x00, 0x01 };

    SecretKeySpec key = new SecretKeySpec(keyBytes, "DES");
    IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
    Cipher cipher = Cipher.getInstance("DES/CTR/NoPadding", "BC");
    System.out.println("input : " + new String(input));

    // encryption pass
    cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
    ctLength += cipher.doFinal(cipherText, ctLength);
    System.out.println("cipher: " + new String(cipherText) + " bytes: " + ctLength);

    // decryption pass
    cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
    byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
    ptLength += cipher.doFinal(plainText, ptLength);
    System.out.println("plain : " + new String(plainText) + " bytes: " + ptLength);
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    String s = "This is a test.";
    for (int i = 0; i < s.length(); ++i)
        outStream.write(s.charAt(i));/*from  w  w w  . jav  a  2s.c  om*/
    System.out.println("outstream: " + outStream);
    System.out.println("size: " + outStream.size());
    ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray());
    int inBytes = inStream.available();
    System.out.println("inStream has " + inBytes + " available bytes");
    byte inBuf[] = new byte[inBytes];
    int bytesRead = inStream.read(inBuf, 0, inBytes);
    System.out.println(bytesRead + " bytes were read");
    System.out.println("They are: " + new String(inBuf));
}