HashMap<Character,Integer>map= new HashMap<Character,Integer>(); //i表示字符串终点,j表示下次查找的起点,只会越来越大intj =0;intmax=0;for(inti =0; i < s.length(); i++){if(map.containsKey(s.charAt(i))){ j = Math.max(j,map.get(s.charAt(i)) +1); }map.put(s.charAt(i),i...
Set<Map.Entry<String,String>> maplist = map.entrySet();//通过键值对遍历集合 for(Map.Entry<String,String> index:maplist) { System.out.println(index.getKey()+","+index.getValue()); } */ //System.out.println(map); HashMap<Student, Address> map2 = new HashMap<Student, Address>();...
publicintfindMin(Map<Character,Integer>map){if(map.isEmpty())return-1;intmin= Integer.MAX_VALUE;for(intval :map.values()){min= Math.min(min,val); }returnmin; } 总结 349.Intersection of Two Arrays:可以用两个HashSet降低时间复杂度,也可以用一个HashSet对数组进行排序以后用两个指针降低空间复...
HashMap为类型名，hm变量名new动态申请HashMap()所定义类型函数前为字符串，后为整型；
HashMap<String, Integer>为类型名，hm变量名 new动态申请 HashMap<String, Integer>()所定义类型函数 前为字符串，后为整型；
让我们来举例说明如何使用Map来统计字符串中每个字符的出现频率。 importjava.util.HashMap;importjava.util.Map;publicclassCharFrequency{publicstaticvoidmain(String[]args){Stringinput="banana";Map<Character,Integer>frequencyMap=newHashMap<>();for(charc:input.toCharArray()){frequencyMap.put(c,frequencyMap...
newHashMap(4); } mapInt.put(name, new Integer(val)); } 代码示例来源:origin: org.ops4j.pax.wicket/pax-wicket-service /** * @see java.io.ObjectOutputStream.PutField#put(java.lang.String, long) */ @Override public void put(String name, long val) { if (mapLong == null) { map...
map.put('你',2); * * 3.把map中的数据写入文件 * * @author jit * @create 2020 下午 3:47 */ public class WordCount { public static void main(String[] args) { FileReader fr = null; BufferedWriter bw = null; try { //1.创建Map集合 Map<character, integer> map = new HashMap<...
java.util.HashMap.newHashMap(int) 19 Creates a new, empty HashMap suitable for the expected number of mappings. java.util.HashSet.newHashSet(int) 19 Creates a new, empty HashSet suitable for the expected number of elements. java.util.LinkedHashMap.newLinkedHashMap(int) 19 Creates a new...
Integer 可通过设置 java.lang.Integer.IntegerCache.high 扩大缓存区间 目的是为了避免频繁的创建和销毁...