Java . lang . string . compare to()
原文:https://www.geeksforgeeks.org/java-lang-string-compareto/
【比较】()法有三个变型。本文对它们的描述如下 1。int compareTo(对象对象) : 这个方法将这个字符串与另一个对象进行比较。
Syntax :
int compareTo(Object obj)
Parameters :
obj : the Object to be compared.
Return Value :
The value 0 if the argument is a string lexicographically equal to this string;
a value less than 0 if the argument is a string lexicographically greater than this string;
and a value greater than 0 if the argument is a string lexicographically less than this string.
// Java code to demonstrate the
// working of compareTo()
public class Cmp1 {
public static void main(String args[])
{
// Initializing Strings
String str1 = "geeksforgeeks";
String str2 = new String("geeksforgeeks");
String str3 = new String("astha");
// Checking if geeksforgeeks string
// equates to geeksforgeeks object
System.out.print("Difference of geeksforgeeks(obj) and geeksforgeeks(str) : ");
System.out.println(str1.compareTo(str2));
// Checking if geeksforgeeks string
// equates to astha object
System.out.print("Difference of astha(obj) and geeksforgeeks(str) : ");
System.out.println(str1.compareTo(str3));
}
}
输出:
Difference of geeksforgeeks(obj) and geeksforgeeks(str) : 0
Difference of astha(obj) and geeksforgeeks(str) : 6
2。int compare to(String other String):这个方法按照字典顺序比较两个字符串。
Syntax :
int compareTo(String anotherString)
Parameters :
anotherString : the String to be compared.
Return Value :
The value 0 if the argument is a string lexicographically equal to this string;
a value less than 0 if the argument is a string lexicographically greater than this string;
and a value greater than 0 if the argument is a string lexicographically less than this string.
// Java code to demonstrate the
// working of compareTo()
public class Cmp2 {
public static void main(String args[])
{
// Initializing Strings
String str1 = "geeksforgeeks";
String str2 = "geeksforgeeks";
String str3 = "astha";
// Checking if geeksforgeeks string
// equates to geeksforgeeks string
System.out.print("Difference of geeksforgeeks(str) and geeksforgeeks(str) : ");
System.out.println(str1.compareTo(str2));
// Checking if geeksforgeeks string
// equates to astha string
System.out.print("Difference of astha(str) and geeksforgeeks(str) : ");
System.out.println(str1.compareTo(str3));
}
}
输出:
Difference of geeksforgeeks(str) and geeksforgeeks(str) : 0
Difference of astha(str) and geeksforgeeks(str) : 6
3。int compareToIgnoreCase(String str):此方法按字典顺序比较两个字符串，忽略大小写差异。
Syntax :
int compareToIgnoreCase(String str)
Parameters :
str : the String to be compared.
Return Value :
This method returns a negative integer, zero, or a positive integer as
the specified String is greater than, equal to, or less than this String,
ignoring case considerations.
// Java code to demonstrate the
// working of compareToIgnoreCase()
public class Cmp3 {
public static void main(String args[])
{
// Initializing Strings
String str1 = "geeks";
String str2 = "gEEkS";
// Checking if geeksforgeeks string
// equates to geeksforgeeks string
// case sensitive
System.out.print("Difference of geeks and gEEkS (case sensitive) : ");
System.out.println(str1.compareTo(str2));
// Checking if geeksforgeeks string
// equates to astha string
// case insensitive
// using compareToIgnoreCase()
System.out.print("Difference of geeks and gEEkS (case insensitive) : ");
System.out.println(str1.compareToIgnoreCase(str2));
}
}
输出:
Difference of geeks and gEEkS (case sensitive) : 32
Difference of geeks and gEEkS (case insensitive) : 0
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