一.Integer转StringStringstr= xx.toString();//可以把0也变成字符串,但是为null的会变成"null"字符串Stringstr=String.valueOf(xxx);Stringstr= Integer.toString(xxx);//可以把0也变成字符串,但是为null的话会报空指针异常 copy 1 2 3 4 5 6 7 8 9 二.String转Integer 必须进行非空的判断:Stringstr=...
代码运行次数:0 HashMap<String,String>dataMap=newHashMap<>(4);dataMap.put("key1","value1");dataMap.put("key2","value2");dataMap.put("key3","value3");dataMap.put("key4","value4");String byToString=dataMap.toString();String byJSONString=JSON.toJSONString(dataMap);System.out.pr...
import java.util.Map; import java.util.HashMap; public class q9 { public static void main(String[] args) { Map<Float, String> map1 = new HashMap<>(); Map<Integer, String>map2= new HashMap<>(); 我想把我所有的map1键从float转换成Integer。 map1.put(11.1f, "black"); map1.put(...
//默认的TreeMap升序排列Map<String,Integer>map1=newTreeMap<String,Integer>();map1.put("a",222);map1.put("s",111);map1.put("b",222);map1.put("d",222);System.out.println("map1="+map1);//自定义排序方式——降序Map<String,Integer>map=newTreeMap<String,Integer>(newComparator<Strin...
intHashString(stringinput,intmultiplier,intmaxValue,boolcaseSensitive); Parameters input The string to be hashed multiplier A 32-bit integer maxValue If maxValue is zero, the script terminates with a devide-by-zero error. caseSensitive True or false ...
String[] index = COMMA_SPLIT_PATTERN.split(url.getMethodParameter(methodName, HASH_ARGUMENTS,"0")); argumentIndex =newint[index.length];for(inti=0; i < index.length; i++) { argumentIndex[i] = Integer.parseInt(index[i]); }// 将虚拟节点放进virtualInvokersfor(Invoker<T> invoker : inv...
return cartItemList.stream().mapToInt(CartItem::getTotalPrice).sum(); public class Cart {private Integer id;private String title;private List<CartItem> cartItemList;private Integer totalAmmount;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String ...
importjava.util.HashSet;publicclassHashSetExample{publicstaticvoidmain(String[]args){HashSet<Integer>set=newHashSet<>();set.add(10);set.add(20);set.add(30);set.add(40);set.add(50);System.out.println(set);// 输出: [40, 10, 50, 20, 30]}} ...
virtualBucketTimes = virtualBucketTimes; } /** * 计算hash值 * * @param columnValue * @return */ public Integer calculate(String columnValue) { //返回大于等于这个hash值得key SortedMap<Integer, Integer> tail = bucketMap.tailMap(hash.hashUnencodedChars(columnValue).asInt()); if (tail.is...
=-1){digest.update(byteArray,0,bytesRead);}}catch(IOExceptione){e.printStackTrace();}// Convert the byte array to hex stringStringBuilderhexString=newStringBuilder();for(byteb:digest.digest()){Stringhex=Integer.toHexString(0xff&b);if(hex.length()==1)hexString.append('0');hexString.append...