Length: 1 String: t We can also concatenate an empty string to the character to convert it to a string. Quotes with nothing in between represent an empty string. This is one of the simplest and implicit way to get a String object in Java. public class Demo { public static void main...
1 反斜杠：\\ 斜杠：/public static void main(String[] args) {String fileUrl="/pdf/test.pdf";fileUrl= fileUrl.replace("/", "\\");System.out.println("fileUrl "+fileUrl);}在fileurl用反斜杠替换旧的斜杠 2 运行结果如图，(/)斜杠替换成一个反斜杠(\) ，由于反斜杠是转义符号在Java里面...
异常信息示例:java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 0 这个异常一般发生在以下几种情况下: 当我们使用负数作为索引时,例如String str = "Hello"; char c = str.charAt(-1); 当我们使用大于等于字符串长度的索引时,例如String str = "Hello"; char c = str.charAt(10); ...
import java.util.Scanner; public class HelloWorld { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int i = sc.nextInt(); //获取第一个输入的整数 int j = sc.nextInt(); //获取第二个输入的整数 /*** Begin ***/ //在这里调用方法获取返回值 int a =...
result = str1.indexOf("java"); System.out.println(result); // -1 // index of empty string in the string result = str1.indexOf(""); System.out.println(result); // 0 } } Notes: The character 'a' occurs multiple times in the "Learn Java" string. The indexOf() method ret...
Java Copy 输出: IndexofBin str1:10IndexofBin str1 after15thchar:19IndexofBin str1 after30thchar:-1Indexof string str2 in str1:10Indexof str2 after15thchar-1Indexof string str3:19Indexof string str4-1Indexof hardcoded string:2Indexof hardcoded string after4thchar:5 ...
1.String.indexOf()API TheString.indexOf()in Java returns the index location of a specified character or string. TheindexOf()method is an overloaded method and accepts two arguments: substringorch: the substring that needs to be located in the current string. ...
text/java (this.codePointAt(k) == ch) {@code &&} (k >= fromIndex) </blockquote> is true. In either case, if no such character occurs in this string at or after positionfromIndex, then-1is returned. There is no restriction on the value offromIndex. If it is negative, it has the...
String are immutable in Java. You can't change them. You need to create a new string with the character replaced. String myName = "domanokz"; String newName= myName.substring(0,4)+'x'+myName.substring(5); or you can use a StringBuilder: ...
System.out.println(result);// -1// index of empty string in the stringresult = str1.indexOf(""); System.out.println(result);// 0} } 注意: 字符'a'在"Learn Java"字符串中出现多次。indexOf()方法返回'a'的第一次出现的索引(即 2)。