Java 像 strcmp 一样获取字符串之间的整数差异
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Get integer difference between string just like strcmp
提问by Tomá? Zato - Reinstate Monica
I just need a function that will, for two given strings, return negative, positive or zero value. In C, strcmpis used:
我只需要一个函数，它可以为两个给定的字符串返回负值、正值或零值。在 C 中，strcmp使用：
char* a = "Hello";
char* b = "Aargh";
strcmp(a, b); //-1
strcmp(a, a); //0
strcmp(b, a); //1
Does Java have any easy intuitive way to do it, or do I have to use the Comparatorinterface?
Java 是否有任何简单直观的方法来做到这一点，还是我必须使用Comparator界面？
采纳答案by dasblinkenlight
Does Java have any easy intuitive way to do it?
Java 是否有任何简单直观的方法来做到这一点？
Yes, it does: java.lang.Stringimplements Comparable<String>interface, with compareTofunction:
是的，它确实：java.lang.String实现Comparable<String>接口，具有compareTo功能：
int comparisonResult = a.compareTo(b);
There is also a case-insensitive version:
还有一个不区分大小写的版本：
int comparisonResult = a.compareToIgnoreCase(b);
回答by slaadvak
The String.compareTomethod is the way to go in Java.
该String.compareTo方法是Java的路要走。
How to use it :
如何使用它 ：
import java.lang.*;
public class StringDemo {
public static void main(String[] args) {
String str1 = "tutorials", str2 = "point";
// comparing str1 and str2
int retval = str1.compareTo(str2);
// prints the return value of the comparison
if (retval < 0) {
System.out.println("str1 is less than str2");
}
else if (retval == 0) {
System.out.println("str1 is equal to str2");
}
else {
System.out.println("str1 is greater than str2");
}
}
}
Output :
输出 ：
str1 is less than str2
Example taken from : http://www.tutorialspoint.com/java/lang/string_compareto.htm
示例取自：http: //www.tutorialspoint.com/java/lang/string_compareto.htm
回答by codebox
回答by Levent Divilioglu
As it is previously answered, Java has a built-in String.compareTo(String anotherString)method, you should checkout the runtimesources (you should search google for rt.jar).
正如之前回答的那样，Java 有一个内置String.compareTo(String anotherString)方法，您应该检查运行时源（您应该在谷歌搜索rt.jar）。
However, here is a working sample with same logic applied on the compareTomethod;
但是，这里有一个工作示例，在该compareTo方法上应用了相同的逻辑；
Method Implementation
方法实现
public static int stringCompare(String str1, String str2) {
char[] charArray1 = str1.toCharArray();
char[] charArray2 = str2.toCharArray();
int lim = Math.min(charArray1.length, charArray2.length);
int k = 0;
while (k < lim) {
if (charArray1[k] != charArray2[k]) {
return charArray1[k] - charArray2[k];
}
k++;
}
return charArray1.length - charArray2.length;
}
Demo Code
演示代码
public class StringCmp1 {
public static void main(String[] args) {
String str1 = "aa";
String str2 = "ad";
System.out.println("Comparison of '" + str1 + "' and '" + str2 + "'");
System.out.println("Custom Method : " + str1.compareTo(str2));
System.out.println("Built-in Method : " + stringCompare(str2, str1));
System.out.println("\nComparison of '" + str2 + "' and '" + str1 + "'");
System.out.println("Custom Method : " + str2.compareTo(str1));
System.out.println("Built-in Method : " + stringCompare(str1, str2));
}
public static int stringCompare(String str1, String str2) {
char[] charArray1 = str1.toCharArray();
char[] charArray2 = str2.toCharArray();
int lim = Math.min(charArray1.length, charArray2.length);
int k = 0;
while (k < lim) {
if (charArray1[k] != charArray2[k]) {
return charArray1[k] - charArray2[k];
}
k++;
}
return charArray1.length - charArray2.length;
}
}
Output
输出
Comparison of 'aa' and 'ad'
Custom Method : -3
Built-in Method : 3
Comparison of 'ad' and 'aa'
Custom Method : 3
Built-in Method : -3
