Test.java

package cn;

import java.nio.ByteBuffer;

public class Test {
	static int x = 10;
	static int b;
	static {
		x += 5;
	}

	private static int i = 100;
	public static void main(String[] args) {
		testInteger();
		// Integer i01 = 59;
		// int i02 = 59;
		// Integer i03 = Integer.valueOf(59);
		// try {
		// } catch (RuntimeException e) {
		// e.printStackTrace();
		// }
		// Integer i04 = new Integer(59);
		// System.out.println(i01== i02);
		// System.out.println(i01== i03);
		// System.out.println(i03== i04);
		// System.out.println(i02== i04);
		/*Long l=233l;
		byte[] bytesLong = longToBytes(l);  
		System.out.println(bytesToLong(bytesLong));
		
		try {
			test(new int[] { 0, 1, 2, 3, 4, 5 });
		} catch (Exception e) {
			System.out.print("E");
		}
		System.out.println(x);
		boolean b = true ? false : true == true ? false : true;
		System.out.println(b);
		System.out.println(123.23 + 789.20);

		double a = .3 - .2;
		System.out.println(a);
		double y = .2 - .1;
		System.out.println(y);
		double x = (.1 + .1 + .1);
		System.out.println(x);
		System.out.println(x == .3);*/
	}

	static {
		x /= 3;
	};

	private static void test(int[] arr) {
		for (int i = 0; i < arr.length; i++) {
			try {
				if (arr[i] % 2 == 0) {
					throw new NullPointerException();
				} else {
					System.out.print(i);
				}
			} finally {
				System.out.print("e");
			}
		}
	}
	/**
	 * byte[] Long
	 * @param b
	 * @return
	 * 2017-5-12 01:26:28
	 */
	private static ByteBuffer buffer = ByteBuffer.allocate(8); 
	public static Long bytesToLong(byte[] b){
		 buffer.put(b, 0, b.length);    
	     buffer.flip();//need flip     
		return buffer.getLong();
	}
	public static byte[] longToBytes(long x) {    
        buffer.putLong(0, x);    
        return buffer.array();    
    }   
	/**
	 * byte[] String
	 * @param b
	 * @return
	 * 2017-5-12 01:26:28
	 */
	public static String test2(byte[] b){
		return new String(b);
	}

	public static void testInteger(){
		Integer i_1 = new Integer(1);
		Integer i_2 = new Integer(1);
		String str="";
		System.out.println(i_1 == i_2);
	}
}