Java String startsWith()方法与示例
字符串startsWith()方法
startsWith()方法是一个String类方法,用于检查给定的字符串是否以特定的字符序列开头。
如果字符串以给定的字符序列开头-startsWith()方法将返回true,如果字符串不是以给定的字符序列开头-则startsWith()方法将返回false。
语法:
boolean String_object.startsWith(character_sequence);
这里,
String_object是主要字符串,我们必须在其中检查是否以给定的character_sequence开头。
character_sequence是要检查的字符集。
示例
Input:
str = "Hello world!"
Function call:
str.startsWith("Hello");
Output:
true
Input:
str = "NHOOO"
Function call:
str.startsWith("inc");
Output:
false码:
public class Main
{
public static void main(String[] args) {
String str1 = "Hello world!";
String str2 = "NHOOO";
System.out.println(str1.startsWith("Hello"));
System.out.println(str1.startsWith("inc"));
//检查条件
if(str1.startsWith("Hello")){
System.out.println(str1 + " starts with Hello" );
}
else{
System.out.println(str1 + " does not start with Hello" );
}
//注意:方法区分大小写
if(str2.startsWith("inc")){
System.out.println(str2 + " starts with inc" );
}
else{
System.out.println(str2 + " does not start with inc" );
}
}
}输出结果
true false Hello world! starts with Hello NHOOO does not start with inc