如果不进行处理,代码可能会抛出StringIndexOutOfBoundsException异常。下面是一个增强版的实现,能够安全地处理任意长度的字符串: publicclassMain{publicstaticvoidmain(String[]args){Stringinput="H";// 测试短字符串的情况Stringresult=getFirstTwoCharacters(input);System.out.println("前两个字符是: "+result);}...
Here is an example that gets the first character g from the following string: String str = "google"; System.out.println(str.substring(0, 1)); Output: "g" Note: The extraction starts at index 0 and ends before index 1. Similarly, you can also get the first two characters of a strin...
publicclassEndsWithExample{publicstaticvoidmain(String args[]){Stringstr1=newString("This is a test String");Stringstr2=newString("Test ABC");booleanvar1=str1.endsWith("String");booleanvar2=str1.endsWith("ABC");booleanvar3=str2.endsWith("String");booleanvar4=str2.endsWith("ABC"); S...
publicclassJavaRandom{publicstaticvoidmain(String args[]){newMyThread().start();newMyThread().start();}}classMyThreadextendsThread{publicvoidrun(){for(int i=0;i<2;i++){System.out.println(Thread.currentThread().getName()+": "+Math.random());}}} 结果: Thread-1: 0.8043581595645333 Threa...
这被称为样板代码。例如,在清单 2-4 中,行public static void Main(String args[])和清单 2-5 ,public static void Main( )可能分别被归类为 Java 和 C# 端的样板代码。我们将在后面的章节中详细讨论这个概念。 现在,与 Java 相比,C# 对它的许多函数使用了不同的词汇。为了在屏幕上打印文本,我们有控制...
array}// Iterate through the string to find the index of the first unique characterfor(inti=0;i
length()Returns the length of the sequence of characters represented by this object. 返回字符串的长度(或者理解为对应字符数组的长度),如果字符串对象的值为 null 则抛出空指针异常(java.lang.NullPointerException)。 String str = "你好,谷歌!"; ...
The given strings is: testcricket The new string is: estcricke Flowchart: For more Practice: Solve these Related Problems: Write a Java program to remove the first and last characters of a string if they are identical. Write a Java program to conditionally trim a string’s boundaries based...
There is no end '\0' in the Go string, and the length of the string is stored. The time complexity of obtaining the length of the string is constant. No matter how many characters there are in the string, we can quickly get the length value of the string. ...
On Windows, the ProcessBuilder has expanded the quoting of argument strings when starting a process to ensure they are recognized by the application as a single command argument. The set of space characters has been expanded from space (0x20) to include all space characters as defined by java....