StringBuffer strBuffer =newStringBuffer(text);returnstrBuffer.deleteCharAt(text.length() - 1) .toString(); } The position that holds the last character istext.length()-1. We used thetoString()method to get the
String name, float price) { this.name = name; this.id = id; this.price = price; } // 这里是上面3个属性的setter/getter方法,这里省略 public String toString() { return "商品编号:" + id + ",名称:" + name + "
publicclassDatabaseSearchimplementsSearch{@OverridepublicList<String>searchDoc(String keyword){System.out.println("数据搜索 "+keyword);returnnull;}} resources 接下来可以在resources下新建META-INF/services/目录,然后新建接口全限定名的文件:com.cainiao.ys.spi.learn.Search,里面加上我们需要用到的实现类 代码...
Write a Java program to find the first non-repeating character in a string and return its index. Write a Java program to detect the first unique character in a string and then remove it from the string. Write a Java program to determine the first non-repeating character in a string after...
public class Student { static int a = test(); static int test(){ return a; } public static void main(String[] args) { System.out.println(Student.a); } } //输出:0 解析:定义和赋值是两个阶段,在定义时会使用默认值(上面讲的,类的成员变量会有默认值)定义出来之后,如果发现有赋值语句,再进...
publicclassAutoCloseTest{publicstaticvoidmain(String[] args)throwsIOException {// 有final修饰的资源finalBufferedReaderbr=newBufferedReader(newFileReader("AutoCloseTest.java"));// 没有显式使用final修饰,但只要不对该变量重新赋值,该变量就是有效的finalPrintStreamps=newPrintStream(newFileOutputStream("a. txt...
Write a Java program to count the frequency of each character in a string and then output the string with duplicates removed. Write a Java program to remove duplicate letters from a string while preserving the order of their first appearance. ...
The set of space characters has been expanded from space (0x20) to include all space characters as defined by java.lang.Character.isSpaceChar, which includes all Unicode space separator characters, such as EN-SPACE (0x2002), and line separator and paragraph separator characters. core-libs/java....
Then the character at index k in the new character sequence is equal to the character at index k in the old character sequence, if k is less than n; otherwise, it is equal to the character at index k-n in the argument str. 参数: str - a string. 返回: a reference to this ...
class); /** * test * * @return */ @GetMapping("test") public String test() { // 设置 CAT 跟踪模式。 Cat.getManager().setTraceMode(true); log.info("cat info"); try { int i = 1 / 0; } catch (Exception e) { log.error("cat error", e); } return "logback"; } /** *...