Boolean Source Code Analysis

Constants inside the Boolean class:

Boolean.true: This is the constructor that calls Boolean and creates a new Boolean object, so TRUE is a Boolean type. To avoid creating a new Boolean object each time, you can pass Boolean b = boolean.true;

public static Finalboolean true = new Boolean (true);

Boolean.false: This is the constructor that calls Boolean and creates a new Boolean object, so FALSE is a Boolean type.

public static Finalboolean false = new Boolean (false);

The type of Boolean.TYP:TYPE is class<boolean> by calling Calss<t> is a final class with a generic type

Here, the class object is returned by calling the Getprimitiveclass (String name) method of class's static native

public static Final class<boolean>type = Class.getprimitiveclass ("Boolean");

Two constructed classes of a Boolean

The first parameter is the Boolean type.

Public Boolean (Boolean value) {

This.value = value;

}

The second parameter is the string type, when this place calls the ToBoolean (string s) method, ToBoolean (Strin G s) is a private method, and the returned type is a Boolean type. This place only returns True when the string is "true" (regardless of its capitalization), and all other times it returns false.

Public Boolean (String s) {

This (ToBoolean (s));

}

private static Boolean ToBoolean (Stringname) {

Return ((name = null) &&name.equalsignorecase ("true"));

}

This is like the Integer.parseint (string s) method, which converts a string into an object of its own type, which is converted to a Boolean type, where the same constructor is called ToBoolean (Strin G s) method

public static Boolean Parseboolean (Strings) {

Return ToBoolean (s);

}

This method is a unboxing operation that converts a Boolean type value to a Boolean type

public Boolean booleanvalue () {

return value;

}

This method is like an integer valueof (int i) method, which also returns a Boolean instance, which was created early, and this place is a boxing operation. It's just a pre-created instance of the cache. This is a static factory method that creates a Boolean object

public static Boolean valueOf (Boolean b) {

return (b? True:false);

}

Convert a Boolean type to a string type

public static String toString (Boolean b) {

Return b? "True": "false";

}

Convert a value of type Boolean to a string type

Public String toString () {

return value? "True": "false";

}

Converts a Boolean value to the corresponding hashcode

Here's why 1231,1237, these two are already large enough primes. The first is not a composite number, for a hash table or hash map, it is prone to conflict, if the smaller prime numbers, may appear uneven distribution

public int hashcode () {

return value? 1231:1237;

}

Compares two Boolean objects for equality, compares them by converting to a Boolean type, and finally returns a Boolean type of data.

public boolean equals (Object obj) {

if (obj instanceof Boolean) {

return value = = ((Boolean) obj). Booleanvalue ();

}

return false;

}

Determines that the system attribute exists and is the string "true", and returns False if it is not

public static Boolean Getboolean (Stringname) {

Boolean result = false;

try {

result = ToBoolean (System.getproperty (name));

} catch (IllegalArgumentException e) {

} catch (NullPointerException e) {

}

return result;

}

Compares two Boolean variables, if equal returns 0, if not equal, the first variable is true, returns 1, and the first variable is false-returns 1

public static int Compare (Boolean X,boolean y) {

return (x = = y)? 0: (x? 1:-1);

}

Compare two Boolean variables, call the Compare (Booleanx, Boolean y) method

public int CompareTo (Boolean b) {

Return compare (This.value, b.value);

}

Boolean Source Code Analysis