雙類(lèi)compareTo()方法 (Double class compareTo() method)

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

  compareTo()方法在java.lang包中可用。

• compareTo() method is used to check equality or inequality for this Double-object against the given Double-object mathematically or in other words, we can say this method is used to compare two Double objects.

  compareTo()方法用于在數(shù)學(xué)上檢查該Double對(duì)象與給定Double對(duì)象的相等性或不相等性，換句話(huà)說(shuō)，可以說(shuō)此方法用于比較兩個(gè)Double對(duì)象。

• compareTo() 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.

  compareTo()方法是一種非靜態(tài)方法，只能通過(guò)類(lèi)對(duì)象訪(fǎng)問(wèn)，如果嘗試使用類(lèi)名稱(chēng)訪(fǎng)問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• compareTo() method does not throw an exception at the time of comparing Double-object.

  在比較Double-object時(shí)， compareTo()方法不會(huì)引發(fā)異常。

Syntax:

句法：

public int compareTo(Double value2);

Parameter(s):

參數(shù)：

• Double value2 – represents the Double object to compare with.

  Double value2-表示要比較的Double對(duì)象。

Return value:

返回值：

The return type of this method is int, it returns an integer value. It returns 0 if value2 is mathematically equal to value1 (this object), it returns value < 0 if value2 is mathematically greater than value1 (this object), it returns value > 0 if value2 is mathematically less than value1 (this object).

此方法的返回類(lèi)型為int ，它返回一個(gè)整數(shù)值。 它返回0，如果值2是數(shù)學(xué)上等于值1(該對(duì)象)，則返回值<0，如果是數(shù)值2比數(shù)學(xué)VALUE1(此對(duì)象)時(shí)，它返回值> 0，如果值2小于值1數(shù)學(xué)上更小(該對(duì)象)。

Example:

例：

// Java program to demonstrate the example // of compareTo(Double value2) method of Double classpublic class CompareToOfDoubleClass {public static void main(String[] args) {// Variables initializationdouble d1 = 18.20;double d2 = 20.20;// Double instance Double value1 = new Double(d1);Double value2 = new Double(d2);// It compare two Double objects and placed the // result in another variable (compare) of integer typeint compare = value1.compareTo(value2);// Display resultSystem.out.println("value1.compareTo(value2): " + compare);System.out.println();if (compare == 0)System.out.println("value1 is equal to value2");else if (compare < 0)System.out.println("value1 is less than value2");elseSystem.out.println("value1 is greater than value2");} }

Output

輸出量

value1.compareTo(value2): -1value1 is less than value2

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

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