整数类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()方法用于在数学上检查此Integer对象与给定Integer对象的相等性或不相等性，换句话说，可以说此方法用于比较两个Integer对象。
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()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
compareTo() method does not throw an exception at the time of comparing the Integer object.
在比较Integer对象时， compareTo()方法不会引发异常。
Syntax:
句法：
public int compareTo(Integer value2);
Parameter(s):
参数：
Integer value2 – represents the Integer object to compare with.
整数值2 –表示要比较的整数对象。
Return value:
返回值：
The return type of this method is int, it returns an integer value.
此方法的返回类型为int ，它返回一个整数值。
It returns 0 if value1 is mathematically equal to value2.
如果value1在数学上等于value2 ，则返回0 。
It returns the value < 0 if value1 is mathematically less than value2.
如果value1在数学上小于value2 ，则返回值<0 。
It returns the value > 0 if value1 is mathematically greater than value2.
如果value1在数学上大于value2，则它返回> 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
输出量
value1.compareTo(value2): -1value1 is less than value2
翻译自: https://www.includehelp.com/java/integer-class-compareto-method-with-example.aspx
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