Java字符串compareToIgnoreCase()方法与示例
字符串compareToIgnoreCase()方法
compareToIgnoreCase()是Java中的String方法，它通过忽略大小写的敏感性来比较两个字符串。
如果两个字符串相等（不考虑大小写敏感性），则返回0，否则，根据第一个不同的字符差异返回小于0或大于0的值。
语法：
int string1.compareToIgnoreCase(string2);
在这里，string1和string2是要比较的字符串，它返回一个整数值，该值是0，小于0或大于0。
示例
Input:
str1 = "Hello world!"
str2 = "Hello world!"
Output:
0
Input:
str1 = "Hello world!"
str2 = "HELLO WORLD!"
Output:
0
Input:
str1 = "Hello world!"
str2 = "Hi guys!!!"
Output:
-4Java代码使用String.compareToIgnoreCase()方法比较字符串
public class Main
{
public static void main(String[] args) {
String str1 = "Hello world!";
String str2 = "Hello world!";
String str3 = "HELLO WORLD!";
System.out.println("str1 and str2 = " + str1.compareToIgnoreCase(str2));
System.out.println("str1 and str3 = " + str1.compareToIgnoreCase(str3));
System.out.println("str2 and str3 = " + str2.compareToIgnoreCase(str3));
//检查条件
if(str1.compareToIgnoreCase(str2)==0){
System.out.println("str1 is equal to str2");
}
else{
System.out.println("str1 is not equal to str2");
}
if(str1.compareToIgnoreCase(str3)==0){
System.out.println("str1 is equal to str3");
}
else{
System.out.println("str1 is not equal to str3");
}
if(str2.compareToIgnoreCase(str3)==0){
System.out.println("str2 is equal to str3");
}
else{
System.out.println("str2 is not equal to str3");
}
}
}输出结果
str1.compareToIgnoreCase(str2) = 0 str1.compareToIgnoreCase(str3) = 0 str2.compareToIgnoreCase(str3) = 0 str1 is equal to str2 str1 is equal to str3 str2 is equal to str3
public class Main
{
public static void main(String[] args) {
String str1 = "Hello world!";
String str2 = "Hi guys!!!";
if(str1.compareToIgnoreCase(str2)==0){
System.out.println("str1 is equal to str2");
}
else{
System.out.println("str1 is not equal to str2");
}
}
}输出结果
str1 is not equal to str2