使用String.concat()方法 除了使用+操作符外,Java的String类还提供了一个concat()方法,用于连接两个字符串。以下是一个使用concat()方法的示例: publicclassStringConcatExample{publicstaticvoidmain(String[]args){Stringoriginal="Hello,";StringtoAdd=" World!";Stringresult=original.concat(toAdd);System.out.pr...
String now2 = String.format("%s年%s月", LocalDate.now().getYear(), LocalDate.now().getMonthValue()); System.out.println(now2); // xx月xx日 String now3 = String.format("%s月%s日", LocalDate.now().getMonth(), LocalDate.now().getDayOfMonth()); System.out.println(now3); 1. ...
如: public static void main(String[] args) { List<Integer> list = Arrays.asList(1, 2, 1, 1, 1); boolean anyMatch = list.stream().anyMatch(f -> f == (1)); boolean allMatch = list.stream().allMatch(f -> f == (1)); boolean noneMatch = list.stream().noneMatch(f -> f...
//1.创建对象StringJoiner sj =newStringJoiner(", ","[","]");//2.添加元素sj.add("aaa").add("bbb").add("ccc");intlen =sj.length(); System.out.println(len);//15//3.打印System.out.println(sj);//[aaa, bbb, ccc]String str =sj.toString(); System.out.println(str);//[aaa, ...
publicclassHelloWorld {publicstaticvoidmain(String[] args) { String str= "学习JAVA";//定义一个字符串“学习”System.out.println("转换为小写:"+str.toLowerCase());//将字符串转换为小写System.out.println("获取索引为1位置的字符:"+str.charAt(1));//获取索引位置为1的字符byte[] b = str.getBy...
* @param value the value to be stored in the current thread's copy of * this thread-local. */publicvoidset(Tvalue){Thread t=Thread.currentThread();ThreadLocalMap map=getMap(t);if(map!=null)map.set(this,value);elsecreateMap(t,value);} ...
String[]args){Set<String>set=newHashSet<String>();inti=0;while(true){set.add(String.valueOf...
privatefinalString delimiter; privatefinalString suffix; /* * StringBuilder value -- at any time, the characters constructed from the * prefix, the added element separated by the delimiter, but without the * suffix, so that...
Set<String> set = new HashSet<>(); set.add("a"); set.add("b"); set.add("c"); set...
public static void main(String[] args) { List<String> list = new ArrayList<>(); list.add("apple"); list.add("banana"); list.add("orange"); list.add("pear"); String targetValue = "banana"; String replacementValue = "mango"; Iterator<String> iterator = list.iterator(); while (it...