Detailed explanation of the integer wrapper class in Java (Java binary operation, all-in conversion)

Program apes are very lazy, you know!

What we are sharing today is the integer wrapper class. In real-world development, we often need to operate an integer, or a variety of conversions and so on. I will give you a specific explanation of the use of the integer today. Look at the code:

Package Com.herman.test;public class Integertest {public static void main (string[] args) {System.out.println (" Constant in integer **************************** "); SYSTEM.OUT.PRINTLN ("Maximum value of Integer: \ t" +integer.max_value); SYSTEM.OUT.PRINTLN ("Minimum value of Integer: \ t" +integer.min_value); SYSTEM.OUT.PRINTLN (maximum number of digits for integer: (the number of digits in binary complement for an int value.) ) \ t "+integer.size); System.out.println ("type of Integer: \ t" +integer.type); System.out.println (); System.out.println ("Use ************************** of Methods in Integer"); int i=1000; SYSTEM.OUT.PRINTLN ("Binary representation of 1000: \ t" +integer.tobinarystring (i)); SYSTEM.OUT.PRINTLN (the total number of "1" in the binary string of "1000": \ T "+integer.bitcount (i));/** * Numberofleadingzeros calculation method is: (integer.size)- Integer.tobinarystring (+) Length () */system.out.println (the total number of consecutive "0" from the leftmost of "1000" in binary string: \ t "+ Integer.numberofleadingzeros (i)); SYSTEM.OUT.PRINTLN (the total number of consecutive "0" from the rightmost in the binary string of "1000": \ T "+integer.numberoftrailingzeros (i));/** * Integer decode (String NM) * Given a 10 binary, 8 binary, 16 binary regardless of what kind of binary string, * This method can convert the incoming string into an integer of 10 digits and return. */system.out.println ("8 octal is 010, converted to 10 binary: \ T "+integer.decode (" 010 ")); System.out.println ("10 decimal is 10, converted to 10: \ T" +integer.decode ("10")); SYSTEM.OUT.PRINTLN ("16 Hex is 0X10, converted to 10: \ T" +integer.decode ("0X10")); System.out.println ("1000 reverses the bit order of the integer twos complement: \ t" +integer.reverse (i)); System.out.println ("1000 Reverses the Order of integer bytes: \ t" +integer.reversebytes (i));/** * Gets the integer sign, returns 1 as negative, returns 1, 0 returns 0 */system.out.println ("1000 Gets the integer symbol: \ t" +integer.signum (i)); System.out.println ("Create an Integer object of 1000: \ t" +integer.valueof (i)); SYSTEM.OUT.PRINTLN ("The use of the Integer.valueof object (1000 of the radix number): \ t" +integer.valueof ("+");/** * Integer.getinteger The function of (String) is to get the integer value of the system property according to the specified name. * The first parameter will be considered to be the name of the system attribute. * System properties can be obtained via System.getproperty (java.lang.String) method. * attribute value string is interpreted as an integer and returned as an integer object representing the value. * The specific description of the possible number format can be found in the GetProperty definition description.    */system.out.println ("Getinteger is System configuration: \ T" +integer.getinteger ("Sun.arch.data.model"));    System.out.println ("Getinteger is System configuration: \ T" +integer.getinteger ("java.version")); System.out.println ("Getinteger is System configuration: \ T" +integer.getinteger ("java.lang.String")); /** * Assumes that there is an integer value for the Sun.arch.data.model system attribute, returns the integer number * Assuming that the integer value is not present, then returns the value of the reference (VAL) 2 */SYSTEM.OUT.PRINTLN ("Getinteger fetch    Is the system configuration: \ T "+integer.getinteger (" Sun.arch.data.model ", 16)); Returns an int value with a single 1 bit, the position of the highest 1 bit in the specified value, otherwise assuming that the specified itself equals 0, returns 0 System.out.println ("returns the highest bit is 1, the other bit is 0 (right): \ t" +    Integer.highestonebit (i));    System.out.println ("Returns the highest bit is 1, the other bit is 0 (left): \ t" +integer.lowestonebit (i));    System.out.println ("Move I to the left distance, assuming the distance is negative, then move right-distance:\t" +integer.rotateleft (I, 2)); System.out.println ("Move I unsigned right distance, assuming distance is negative, move left-distance. Negative affirmation will be shifted to positive: \ t "+integer.rotateright (I, 2)); System.out.println (); System.out.println ("Method of the integer object uses ******************************"); integer obj=new integer (1000); System.out.println ("1000 is converted to a number of byte types: \ t" +obj.bytevalue ()); System.out.println ("Integer1000 and Integer2000 size comparison: \ t" +obj.compareto (New Integer (2000))); System.out.println ("Integer2000 and Integer1000 size comparison: \ t" +new Integer. CompareTo (obj)); System.out.println ("Integer1000 converted to double type: \ t" +obj.doublevalue ()); System.out.println ("Integer1000 and Integer2000 size comparison: \ t" +obj.equals (New Integer (2000))); System.out.println ("Integer2000 and Integer1000 size comparison: \ t" +new Integer. Equals (obj)); System.out.println ("Integer2000 and Integer1000 size comparison: \ t" +new integer. Equals (New Integer (2000)));    System.out.println ("Integer1000 hash code: \ T" +obj.hashcode ());    SYSTEM.OUT.PRINTLN (int value of "Integer1000: \ T" +obj.intvalue ());    SYSTEM.OUT.PRINTLN ("Long value of Integer1000: \ T" +obj.longvalue ());    SYSTEM.OUT.PRINTLN ("Short value of Integer1000: \ T" +obj.shortvalue ());    System.out.println ("parse string 1000 to int type: \ t" +integer.parseint ("1000")); /** * Integer.parseint ("1000", 2) * Returns the 2 binary (string) of the first parameter (parameter 2 is the binary of the conversion) */System.out.println ("1000 binary returned 2" +integer    . parseint ("1000", 2));    /** * Binary Conversion */SYSTEM.OUT.PRINTLN ("10,000 binary to Binary" +integer.tobinarystring (i));    SYSTEM.OUT.PRINTLN ("10,000 binary to octal: \ t" +integer.tooctalstring (i));    SYSTEM.OUT.PRINTLN ("10,000 binary to 16 binary: \ t" +integer.tohexstring (i)); System.out.println ("Hexadecimal turns into decimal: \ t" +integer.valUeof ("FFFF", +). toString ());    System.out.println ("Hexadecimal turns into binary: \ t" +integer.tobinarystring (integer.valueof ("FFFF", 16)));        SYSTEM.OUT.PRINTLN ("hexadecimal into octal: \ t" +integer.tooctalstring (integer.valueof ("FFFF", 16));    System.out.println ("Octal turns into decimal: \ T" +integer.valueof ("576", 8). toString ());    System.out.println ("Octal turns into binary: \ t" +integer.tobinarystring (integer.valueof ("23", 8));        System.out.println ("octal turns into 16 binary: \ t" +integer.tohexstring (integer.valueof ("23", 8));    SYSTEM.OUT.PRINTLN ("Binary goto decimal: \ t" +integer.valueof ("0101", 2). toString ());    System.out.println ("binary octal: \ t" +integer.tooctalstring (Integer.parseint ("0101", 2)); SYSTEM.OUT.PRINTLN ("Binary turn 16 binary: \ t" +integer.tohexstring (Integer.parseint ("0101", 2)); System.out.println (); System.out.println ("1000 binary form leftmost highest one and all 0 after high, and finally returns the result of int" +integer.highestonebit (i));}}

Performance effects such as the following:

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Detailed explanation of the integer wrapper class in Java (Java binary operation, all-in conversion)