Element --|> Array Element --|> List Element --|> Set Element --|> Map 40%60%使用for-in循环的对象类型数组集合
Iterator<Integer> iterator = list.iterator();while(iterator.hasNext()) {// iterator.remove()前,必须先执行iterator.next(),将next element的索引+1,否则会出现IllegalStateExceptionInteger num = iterator.next(); System.out.println("当前遍历:"+ num);if(num %2==0) { iterator.remove(); System....
for (String str : list){ if(str.equals("a")) list.remove(str); } System.out.println(list); 1. 2. 3. 4. 5. 报错信息: Exception in thread "main" java.util.ConcurrentModificationException at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:911) at java.util.ArrayList$Itr....
int size=userList.size();// 普通 for 循环for(int i=0;i<size;i++){size=userList.size();User user=userList.get(i);if(user.age==15){userList.remove(2);}} forEach循环 For-Each 是 Java5 中引入的另一种数组遍历技术,它以类似于常规for循环的关键字开头具有以下特点: 无需声明和初始化...
<insert id="batchInsert"parameterType="java.util.List">insert intoUSER(id,name)values<foreach collection="list"item="model"index="index"separator=",">(#{model.id},#{model.name})</foreach></insert> 这个方法提升批量插入速度的原理是,将传统的: ...
<insertid="batchInsert"parameterType="java.util.List"> insertintoUSER(id,name)values <foreachcollection="list"item="model"index="index"separator=","> (#{model.id},#{model.name}) </foreach> </insert> 这个方法提升批量插入速度的原理是,将传统的。另外公众 号Java精选,回复java面试,获取面试资料...
v.addElement("hello"); v.addElement("world"); v.addElement("java"); // 遍历 for (int x = 0; x < v.size(); x++) { String s = (String) v.elementAt(x); System.out.println(s); } System.out.println("---"); Enumeration en = v.elements...
Specifies the position of the text in a field for aTextsectional element. SectionalElementwithText(Stringtext) The text for aTextsectional element. SectionalElementwithType(Stringtype) The type of sectional element. Methods inherited from class java.lang.Object ...
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ElementJava 8 valueJava 11 valueJava 17 valueJava 21 value (Preview, Linux)Description Java.version1.8111721Version of Java used by the maven-compiler-plugin. JavaVersion8111721Java version hosted by the function app in Azure. The following examples show the settings for Java 8 in the relevant ...