整數類compareTo()方法 (Integer 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 Integer object against the given Integer object mathematically or in other words, we can say this method is used to compare two Integer objects.
compareTo()方法用于在數學上檢查此Integer對象與給定Integer對象的相等性或不相等性，換句話說，可以說此方法用于比較兩個Integer對象。
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。
compareTo() method does not throw an exception at the time of comparing the Integer object.
在比較Integer對象時， compareTo()方法不會引發異常。
Syntax:
句法：
public int compareTo(Integer value2);
Parameter(s):
參數：
Integer value2 – represents the Integer object to compare with.
整數值2 –表示要比較的整數對象。
Return value:
返回值：
The return type of this method is int, it returns an integer value.
此方法的返回類型為int ，它返回一個整數值。
It returns 0 if value1 is mathematically equal to value2.
如果value1在數學上等于value2 ，則返回0 。
It returns the value < 0 if value1 is mathematically less than value2.
如果value1在數學上小于value2 ，則返回值<0 。
It returns the value > 0 if value1 is mathematically greater than value2.
如果value1在數學上大于value2，則它返回> 0的 值 。
Example:
例：
// Java program to demonstrate the example
// of compareTo(Integer value2) method of Integer class
public class CompareToOfIntegerClass {
public static void main(String[] args) {
// Variables initialization
int i1 = 10;
int i2 = 20;
// Integer instance
Integer value1 = new Integer(i1);
Integer value2 = new Integer(i2);
// It compare two Integer objects and placed the
// result in another variable (compare) of integer type
int compare = value1.compareTo(value2);
// Display result
System.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");
else
System.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/integer-class-compareto-method-with-example.aspx
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