java位操作和逻辑操作
1.java的位运算符
/** * 计算机对有符号数（包括浮点数）的表示有三种方法：原码、反码和补码， 补码=反码+1。 在 二进制里，是用 0 和 1 * 来表示正负的，最高位为符号位，最高位为 1 代表负数，最高位为 0 代表正数。 * * @author Administrator * */public class ShiftOperator {public static void main(String[] args) {leftMove();rightMove();unSignRightMove();}/** * 左移位运算符（<<）能将运算符左边的运算对象向左移动运算符右侧指定的位数（在低位补 0） * * 负数的情况:十进制如何转为二进制 1.先将-5的绝对值转换成二进制，即为0000 0101 2.然后求该二进制的反码，即为 1111 1010 * 3.最后将反码加1，即为：1111 1011 * Integer是32位(bit)的,所以结果是：11111111111111111111111111111011 */public static void leftMove() {System.out.println("左移运算符");int start_1 = 5;System.out.println(start_1 + ":" + Integer.toBinaryString(start_1));int end_1 = 5 << 2;System.out.println(end_1 + ":" + Integer.toBinaryString(end_1));int start_2 = -5;System.out.println(start_2 + ":" + Integer.toBinaryString(start_2));int end_2 = -5 << 2;System.out.println(end_2 + ":" + Integer.toBinaryString(end_2));}/** * "有符号"右移位运算符(>>)则将运算符左边的运算对象向右移动运算符右侧指定的位数 若值为正，则在高位插入0；若值为负，则在高位插入1 */public static void rightMove() {System.out.println("(有符号)右移位运算符运算符");int start_1 = 5;System.out.println(start_1 + ":" + Integer.toBinaryString(start_1));int end_1 = 5 >> 2;System.out.println(end_1 + ":" + Integer.toBinaryString(end_1));int start_2 = -5;System.out.println(start_2 + ":" + Integer.toBinaryString(start_2));int end_2 = -5 >> 2;System.out.println(end_2 + ":" + Integer.toBinaryString(end_2));}/** * 右移位运算符(>>>):零填充高位 */public static void unSignRightMove() {System.out.println("右移位运算符运算符");int start_1 = 5;System.out.println(start_1 + ":" + Integer.toBinaryString(start_1));int end_1 = 5 >>> 2;System.out.println(end_1 + ":" + Integer.toBinaryString(end_1));int start_2 = -5;System.out.println(start_2 + ":" + Integer.toBinaryString(start_2));int end_2 = -5 >>> 2;System.out.println(end_2 + ":" + Integer.toBinaryString(end_2));}}/** * & 与；| 或；~ 非（也叫做求反）；^ 异或 * * @author Administrator * */public class LogicOperator {public static final String INT_ZENO = "00000000000000000000000000000000";public static void main(String[] args) {operator_1();operator_2();operator_3();operator_4();}/** * 两个都为 1时才为1，否则为0 */public static void operator_1() {System.out.println("与运算符(&)");int first_1 = 5;int second_1 = 3;System.out.println(first_1 + ":"+ getFullBinary(Integer.toBinaryString(first_1)));System.out.println(second_1 + ":"+ getFullBinary(Integer.toBinaryString(second_1)));int result_1 = 5 & 3;System.out.println(result_1 + ":"+ getFullBinary(Integer.toBinaryString(result_1)));int first_2 = -5;int second_2 = 3;System.out.println(first_2 + ":"+ getFullBinary(Integer.toBinaryString(first_2)));System.out.println(" " + second_2 + ":"+ getFullBinary(Integer.toBinaryString(second_2)));int result_2 = -5 & 3;System.out.println(" " + result_2 + ":"+ getFullBinary(Integer.toBinaryString(result_2)));}/** * 只要有一个为1，结果为1 */public static void operator_2() {System.out.println("或运算符(|)");int first_1 = 5;int second_1 = 3;System.out.println(first_1 + ":"+ getFullBinary(Integer.toBinaryString(first_1)));System.out.println(second_1 + ":"+ getFullBinary(Integer.toBinaryString(second_1)));int result_1 = 5 | 3;System.out.println(result_1 + ":"+ getFullBinary(Integer.toBinaryString(result_1)));int first_2 = -5;int second_2 = 3;System.out.println(first_2 + ":"+ getFullBinary(Integer.toBinaryString(first_2)));System.out.println(" " + second_2 + ":"+ getFullBinary(Integer.toBinaryString(second_2)));int result_2 = -5 | 3;System.out.println(result_2 + ":"+ getFullBinary(Integer.toBinaryString(result_2)));}/** * 1变为0,0变为1 */public static void operator_3() {System.out.println("非运算符(~)");int first_1 = 5;System.out.println(" " + first_1 + ":"+ getFullBinary(Integer.toBinaryString(first_1)));int result_1 = ~5;System.out.println(result_1 + ":"+ getFullBinary(Integer.toBinaryString(result_1)));}/** * 两个相同时为1，不同时为0 */public static void operator_4() {System.out.println("异或运算符(^)");int first_1 = 5;int second_1 = 3;System.out.println(first_1 + ":"+ getFullBinary(Integer.toBinaryString(first_1)));System.out.println(second_1 + ":"+ getFullBinary(Integer.toBinaryString(second_1)));int result_1 = 5 ^ 3;System.out.println(result_1 + ":"+ getFullBinary(Integer.toBinaryString(result_1)));int first_2 = -5;int second_2 = 3;System.out.println(first_2 + ":"+ getFullBinary(Integer.toBinaryString(first_2)));System.out.println(" " + second_2 + ":"+ getFullBinary(Integer.toBinaryString(second_2)));int result_2 = -5 ^ 3;System.out.println(result_2 + ":"+ getFullBinary(Integer.toBinaryString(result_2)));}private static String getFullBinary(String binaryString) {return INT_ZENO.substring(binaryString.length()) + binaryString;}}