= expectedModCount) { throw new ConcurrentModificationException(); } } // java.io.Serializable的读取函数:根据写入方式读出 // 先将ArrayList的“容量”读出,然后将“所有的元素值”读出 private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, ClassNotFoundException { elementData...
this.intoSqls = initIntoSqls(); } @Override public String[] initSynSqls() { List<PrSynRule> ruleList = prSynRuleService.querySynRuleList(prSynRule); if(ruleList!=null && ruleList.size()>0){ prSynRule = ruleList.get(0); startDate = startTime(); } return new String[]{prSynR...
importjava.io.File;importjava.io.FileInputStream;importjava.io.IOException;importjava.io.OutputStream;importjava.net.HttpURLConnection;importjava.net.URL;publicclassFileUploader{privatestaticfinalintBUFFER_SIZE=4096;publicstaticvoiduploadFile(String targetUrl, String filePath)throwsIOException {Filefile=newF...
We can useCollectors.partitioningBy()to split the list into 2 sublists: @Test public void givenList_whenParitioningIntoSublistsUsingPartitionBy_thenCorrect() { List<Integer> intList = Lists.newArrayList(1, 2, 3, 4, 5, 6, 7, 8); Map<Boolean, List<Integer>> groups = intList.stream()....
parallelStream,removeIf,stream Methods inherited from interface java.lang.Iterable forEach Method Detail size int size() Returns the number of elements in this list. If this list contains more thanInteger.MAX_VALUEelements, returnsInteger.MAX_VALUE. ...
stream (). collect ( // 抛出 NullPointerException 异常 Collectors . toMap ( Pair :: getKey , Pair :: getValue , ( v1 , v2 ) -> v2 )); 5. 【强制】 ArrayList 的 subList 结果不可强转成 ArrayList,否则会抛出 ClassCastException 异 常: java.util.RandomAccessSubList cannot be ...
* any operation that adds or deletes one or more elements, or explicitly * resizes the backing array; merely setting the value of an element is not * a structural modification.) This is typically accomplished by * synchronizing on some object that naturally encapsulates the list. ...
pstmt = conn.prepareStatement(sql);for(Stringstr:list.subList(start, end)){String[] s = str.split("\t"); pstmt.setInt(1,Integer.parseInt(s[0])); pstmt.setString(2,s[1]); pstmt.setString(3,s[2]); pstmt.setString(4,s[3]); ...
split("13"); String[] strs = str1.split("我"); System.out.println(Arrays.toString(strs));//输出为[你爱, , 爱你] System.out.println(Arrays.toString(strs1));//输出为[, 2, 514] String str3 = "12,cd,3f,g"; //以, 切割 引用.split String[] strs2 = str3.split(","); ...
3. 【强制】在使用java.util.stream.Collectors 类的 toMap() 方法转为 Map 集合时,一定要使用参数类型为 BinaryOperator,参数名为 mergeFunction 的方法,否则当出现相同 key 时会抛出IllegalStateException 异常。说明:参数 mergeFunction 的作用是当出现 key 重复时,自定义对 value 的处理策略。正例: List<Pair<...