public class Main { public static String getLastThreeCharacters(String str) { // 检查输入字符串是否为空或null if (str == null || str.isEmpty()) { throw new IllegalArgumentException("Input string cannot be null or empty"); } // 检查字符串长度是否大于等于3 if (str.length() < 3)...
World!";StringlastThreeChars=getLastThreeCharacters(original);System.out.println("Original String: "+original);System.out.println("Last Three Characters: "+lastThreeChars);}publicstaticStringgetLastThreeCharacters(Stringstr){if(str.length()<3){returnstr;// 如果字符串长度小于3,返回原字符串}returns...
为了方便起见,我们可以结合字符串的长度来获取后三位字符。例如,对于任意长度大于等于3的字符串,我们可以使用substring()方法和字符串的长度来获取后三位字符。具体代码如下: AI检测代码解析 StringgetLastThreeCharacters(Stringstr){intlength=str.length();returnstr.substring(length-3,length);} 1. 2. 3. 4. ...
3|3StringBuffer和Stringbuilder 底层是继承父类的可变字符数组value /** - The value is used for character storage. */ char[] value; 初始化容量为16 /** - Constructs a string builder with no characters in it and an - initial capacity of 16 characters. */ public StringBuilder() { super(...
publicstaticvoidmain(String[] args) {/** * 情景一:字符串池 * JAVA虚拟机(JVM)中存在着一个字符串池,其中保存着很多String对象; * 并且可以被共享使用,因此它提高了效率。 * 由于String类是final的,它的值一经创建就不可改变。 * 字符串池由String类维护,我们可以调用intern()方法来访问字符串池。*/St...
("First name must be 2 characters or more.");}}// Alternative ConstructorpublicEmployee(int id,String firstName){this(id,firstName,null);}// Instance methodspublicvoidgetFullName(){if(lastName==null)System.out.println(firstName());elseSystem.out.println(firstName()+" "+lastName());}/...
The position in the string of the first character to be copied. end Required. The position in the string after the last character to be copied. destination Required. The array to which the characters are copied. position Required. The position in the destination array to which the copied ...
String StringBuffer StringBufferInputStream StringBuilder StringCharacterIterator StringContent StringHolder StringIndexOutOfBoundsException StringMonitor StringMonitorMBean StringNameHelper StringReader StringRefAddr StringSelection StringSeqHelper StringSeqHolder StringTokenizer StringValueExp Str...
Learn how toget last 4 characters of aStringor simply any number of the last characters of a string in Java. 1. Using Plain Java We may need to get the last 4 characters when we are dealing with customer-sensitive data such as phone numbers or SSNs. In this case, we need to displa...
Write a Java program to create another string of 4 copies of the last 3 characters of the original string. The original string length must be 3 and above.Pictorial Presentation:Sample Solution:Java Code:import java.lang.*; public class Exercise68 { public static void main(String[] args) {...