深入學習java原始碼之下Boolean類

布林類將物件中的基元型別boolean的值進行包裝。 型別為Boolean的物件包含一個單一欄位，其型別為boolean 。

此外，該類還提供了許多將boolean轉換為String和String轉換為boolean ，以及在處理boolean時有用的其他常量和方法。

方法摘要

靜態方法

介面方法

java原始碼

public final class Boolean implements java.io.Serializable,
                                      Comparable<Boolean>
{

public static final Boolean TRUE = new Boolean(true);


public static final Boolean FALSE = new Boolean(false);

 @SuppressWarnings("unchecked")
    public static final Class<Boolean> TYPE = (Class<Boolean>) Class.getPrimitiveClass("boolean");


private final boolean value;

private static final long serialVersionUID = -3665804199014368530L;

public Boolean(boolean value) {
        this.value = value;
}

public Boolean(String s) {
        this(parseBoolean(s));
}

    public static boolean parseBoolean(String s) {
        return ((s != null) && s.equalsIgnoreCase("true"));
    }
    public boolean booleanValue() {
        return value;
    }

    public static Boolean valueOf(boolean b) {
        return (b ? TRUE : FALSE);
    }
    public static Boolean valueOf(String s) {
        return parseBoolean(s) ? TRUE : FALSE;
    }

    public static String toString(boolean b) {
        return b ? "true" : "false";
    }

    public String toString() {
        return value ? "true" : "false";
    }
    @Override
    public int hashCode() {
        return Boolean.hashCode(value);
    }
    public static int hashCode(boolean value) {
        return value ? 1231 : 1237;
    }
    public boolean equals(Object obj) {
        if (obj instanceof Boolean) {
            return value == ((Boolean)obj).booleanValue();
        }
        return false;
    }
    public static boolean getBoolean(String name) {
        boolean result = false;
        try {
            result = parseBoolean(System.getProperty(name));
        } catch (IllegalArgumentException | NullPointerException e) {
        }
        return result;
    }
    public int compareTo(Boolean b) {
        return compare(this.value, b.value);
    }

    public static int compare(boolean x, boolean y) {
        return (x == y) ? 0 : (x ? 1 : -1);
    }
    public static boolean logicalAnd(boolean a, boolean b) {
        return a && b;
    }
    public static boolean logicalOr(boolean a, boolean b) {
        return a || b;
    }

    public static boolean logicalXor(boolean a, boolean b) {
        return a ^ b;
    }
}