Example usage for java.lang String String

List of usage examples for java.lang String String

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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:Main.java

public static void main(String[] args) throws Exception {
    DatagramChannel client = null;
    client = DatagramChannel.open();

    client.bind(null);/*from w  w  w .  j  a  v  a2 s .  com*/

    String msg = "Hello";
    ByteBuffer buffer = ByteBuffer.wrap(msg.getBytes());
    InetSocketAddress serverAddress = new InetSocketAddress("localhost", 8989);

    client.send(buffer, serverAddress);
    buffer.clear();
    client.receive(buffer);
    buffer.flip();
    int limits = buffer.limit();
    byte bytes[] = new byte[limits];
    buffer.get(bytes, 0, limits);
    String response = new String(bytes);
    System.out.println("Server  responded: " + response);
    client.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    // Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    byte[] input = "input".getBytes();
    byte[] ivBytes = "1234567812345678".getBytes();

    Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
    KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
    generator.init(128);//from w  w  w .  ja v  a  2 s  .  c  om
    Key encryptionKey = generator.generateKey();
    System.out.println("key : " + new String(encryptionKey.getEncoded()));

    cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
    ctLength += cipher.doFinal(cipherText, ctLength);
    Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());

    cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
    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));
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Object object = new JButton("push me");

    ObjectOutput out = new ObjectOutputStream(new FileOutputStream("filename.ser"));
    out.writeObject(object);/*from   w w w .  j  a  v  a  2s  .  c  o m*/
    out.close();

    // Serialize to a byte array
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    out = new ObjectOutputStream(bos);
    out.writeObject(object);
    out.close();

    // Get the bytes of the serialized object
    byte[] buf = bos.toByteArray();
    System.out.println(new String(buf));
}

From source file:Main.java

public static void main(String[] args) {
    boolean b = true;
    StringBuffer sb1 = new StringBuffer();
    sb1.append(b);//from   w  w w  .  j a va  2s. com
    System.out.println(sb1);

    char c = 'Y';
    sb1.append(c);
    System.out.println(sb1);

    char[] c1 = new char[] { 'Y', 'e', 's' };
    sb1.append(c1);

    System.out.println(sb1);

    double d = 1.0;
    sb1.append(d);
    System.out.println(sb1);

    float f = 1.0f;
    sb1.append(f);
    System.out.println(sb1);

    int i = 1;
    sb1.append(i);
    System.out.println(sb1);

    long l = 1;
    sb1.append(l);

    System.out.println(sb1);

    Object obj = new String("Yes");
    sb1.append(obj);
    System.out.println(sb1);

    String str = new String("Yes");
    sb1.append(str);
    System.out.println(sb1);
}

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[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
            0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };

    SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
    Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding", "BC");
    System.out.println("input text : " + new String(input));

    // encryption pass

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

    // decryption pass

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

From source file:com.java.demo.DesDemo.java

public static void main(String[] args) {
    //des(data crpt)
    Init();/*from w w w  .  ja  v a 2  s.  c  o  m*/
    byte[] strBytes = Encrypt("abc");
    System.out.println(Hex.encodeHexString(strBytes));
    byte[] str = Decrypt(strBytes);
    System.out.println(new String(str));
}

From source file:Main.java

public static void main(String[] args) {
    boolean b = true;
    StringBuffer sb1 = new StringBuffer("1234567890");
    sb1.insert(6, b);/* w w  w.j a v a 2  s  .  com*/
    System.out.println(sb1);

    char c = 'Y';
    sb1.insert(6, c);
    System.out.println(sb1);

    char[] c1 = new char[] { 'Y', 'e', 's' };
    sb1.insert(6, c1);
    System.out.println(sb1);

    double d = 1.0;
    sb1.insert(6, d);
    System.out.println(sb1);

    float f = 2.0f;
    sb1.insert(6, f);
    System.out.println(sb1);

    int i = 5;
    sb1.insert(6, i);
    System.out.println(sb1);

    long l = 10;
    sb1.insert(6, l);
    System.out.println(sb1);

    Object obj = new String("b");
    sb1.insert(6, obj);
    System.out.println(sb1);

    String str = "a";
    sb1.insert(6, str);
    System.out.println(sb1);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    //Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    byte[] input = "input".getBytes();
    byte[] keyBytes = "input123".getBytes();

    SecretKeySpec key = new SecretKeySpec(keyBytes, "ARC4");

    Cipher cipher = Cipher.getInstance("ARC4", "BC");

    byte[] cipherText = new byte[input.length];

    cipher.init(Cipher.ENCRYPT_MODE, key);

    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);

    ctLength += cipher.doFinal(cipherText, ctLength);

    System.out.println("cipher text: " + new String(cipherText));

    byte[] plainText = new byte[ctLength];

    cipher.init(Cipher.DECRYPT_MODE, key);

    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);

    ptLength += cipher.doFinal(plainText, ptLength);

    System.out.println("plain text : " + new String(plainText));
}

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);/*from  w  ww. j a  v a2s.co  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 the whole content
    byte[] b = new byte[13];
    ois.readFully(b);
    String array = new String(b);
    System.out.println(array);
    ois.close();
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    byte[] input = "input".getBytes();
    byte[] keyBytes = "input123".getBytes();

    SecretKeySpec key = new SecretKeySpec(keyBytes, "ARC4");

    Cipher cipher = Cipher.getInstance("ARC4", "BC");

    byte[] cipherText = new byte[input.length];

    cipher.init(Cipher.ENCRYPT_MODE, key);

    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);

    ctLength += cipher.doFinal(cipherText, ctLength);

    System.out.println("cipher text: " + new String(cipherText));

    byte[] plainText = new byte[ctLength];

    cipher.init(Cipher.DECRYPT_MODE, key);

    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);

    ptLength += cipher.doFinal(plainText, ptLength);

    System.out.println("plain text : " + new String(plainText));
}