我们知道Set的集合是无序、不可重复的集合,首先,我们来看一下HashSet,HashSet是set集合中用的最多的,so,我们来看下面的一个小例子: package j2se.demo;import java.util.HashSet;public class SetTest1 { public static void main(String[] args) { HashSet set = new HashSet(); set.add("a"); set....
import java.util.HashMap; import java.util.Map; /*j a v a2s.com*/ public class Main{ public static void main(String[] a) { Map<String,String> map = new HashMap<String,String>(); map.put("key1", "value1"); map.put("key2", "value2"); map.put("key3", "value3"); ...
Map<String, String> map = new HashMap<>(); for (String key : map.keySet()) { System.out.println("key= " + key + " and value= " + map.get(key)); } 1. 2. 3. 4. 第三种:使用lamdba表达式 HashMap<String, Integer> map = new HashMap<>(); map.put("A", 1); map.put(...
booleanignoreReadOnly)throwsProperty.ReadOnlyException,ConversionException,InvalidValueException{if(isMultiSelect()){if(newFieldValue==null){super.setValue(newLinkedHashSet<Object>(),repaintIsNotNeeded,ignoreReadOnly);}elseif(Collection.class.isAssignableFrom(newFieldValue.getClass())){super.setValue(new...
();MapnewUserData=newHashMap<Object,Object>();if(userData!=null){if(userDatainstanceofMap){newUserData.putAll((Map)userData);}elseif(userDatainstanceofCoordinateReferenceSystem){newUserData.put(CoordinateReferenceSystem.class,userData);}}// set gml:id and attributes in Geometry userDataif(target....
NOSERVICE); } if (expProfile == null) { throw new Exception("No ExpansionProfile provided"); } try { Map<String, String> params = new HashMap<String, String>(); params.put("_limit", Integer.toString(expandCodesLimit)); params.put("_incomplete", "true"); tlog("Terminology Server: ...
publicclassMapTest {publicMap<String, Student>students;publicScanner console;publicMapTest() {this.students =newHashMap<String, Student>();this.console =newScanner(System.in); }publicvoidtestContainsKeyOrValue() { System.out.println("请输入学生ID:"); ...
importjava.util.*; importjava.util.Scanner; publicclassCountNum { publicstaticvoidmain(String[] args){ HashMap<Integer, Integer> hashMap =newHashMap<Integer,Integer>(); Scanner input =newScanner(System.in); intnum = input.nextInt(); ...
LogUtil.e("transformationsMap 数据转换变化:$output") } //使用原始的LiveData发送数据 mapLiveData.value = 10 } 打印数据如下: /com.sum.tea E/LogUtil: transformationsMap 数据转换变化:20 三、LiveData实现原理 1.粘性事件分发流程 先从LiveData 注册观察者看起: ...
问Java编辑excel文件- cell.setCellValue不工作EN代码 package com.util; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.io.UnsupportedEncodingException; ...