public class Demo3 {
public static void main(String[] args) {
String fileName = "HelloWorld.java";
String email = "laurenyang@imooc.com";
int index = fileName.lastIndexOf(".");
String prefix = fileName.substring(index);
if ( index > 0 && (prefix.equals(".java"))) {
System.out.println("Java文件名正确");
} else {
System.out.println("Java文件名无效");
}
int index2 = email.indexOf("@");
int index3 = email.indexOf('.');
if (index2 != -1 && index3 > index2) {
System.out.println("邮箱格式正确");
} else {
System.out.println("邮箱格式无效");
}
}
}
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