雙類hashCode()方法 (Double class hashCode() method)

• hashCode() method is available in java.lang package.

  hashCode()方法在java.lang包中可用。

• hashCode() method is used to return hashcode of the Double-object.

  hashCode()方法用于返回Double對象的哈希碼。

• hashCode() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  hashCode()方法是一個非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• hashCode() method does not throw an exception at the time of returning hashcode.

  hashCode()方法在返回哈希碼時不會引發異常。

Syntax:

句法：

    public int hashCode();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of this method is int, it returns hash code for this object.

此方法的返回類型為int ，它返回此對象的哈希碼。

Example:

例：

// Java program to demonstrate the example 
// of int hashCode() method of Double class
public class HashCodeOfDoubleClass {
public static void main(String[] args) {
// Variables initialization
double value1 = 30.20;
double value2 = 10.20;
// It returns hashcode value denoted by this Double d1 object
// by calling d1.hashCode()
Double d1 = new Double(value1);
// Display d1 result
System.out.println("d1.hashCode(): " + d1.hashCode());
// It returns hashcode value denoted by this Double d2 object
// by calling d2.hashCode()
Double d2 = new Double(value2);
// Display d2 result
System.out.println("d2.hashCode(): " + d2.hashCode());
}
}

Output

輸出量

d1.hashCode(): 1930231808
d2.hashCode(): 641859584

翻譯自: https://www.includehelp.com/java/double-class-hashcode-method-with-example.aspx