StringBuilder a = new StringBuilder(); StringBuilder b = a.append("hahah"); if(a == b){ } 此处:相当于将给a追加后,将a的地址赋值给b,所以a和b是相等的。 所以再使用append方法时,无需接收返回值。 1. 2. 3. 4. 5. 6. 7. toString() 将StringBuilder转为String类型 数组使用 ArrayList 底层...
TheString.concatmethod concatenates the specified string to the end of this string. Main.java void main() { System.out.println("Return".concat(" of ").concat("the king.")); } In the example, we add strings withString.concat. Using String.join TheString.joinmethod returns a new atring...
首先贴出以下的代码,简单的使用AtomicInteger这个类来实现+1的操作。 importjava.util.concurrent.atomic.AtomicInteger;publicclassCASTest{publicstaticvoidmain(String[] args){AtomicIntegeratomicInteger=newAtomicInteger(10);for(inti=0; i <10; i ++) {newThread(newRunnable() {@Overridepublicvoidrun(){atomicInt...
Use the latest version of ArcGIS Maps SDK for Java to build apps that incorporate capabilities such as mapping, geocoding, routing, and spatial analysis, for deployment to Windows, Linux, and macOS platforms.
public static void main(String[] args) { //循环次数 int count = 100000000; System.out.println("Collections.addAll()耗时:" + collectionsTest(count) + "ms"); System.out.println("arrays.addAll()耗时:" + arraysTest(count) + "ms"); ...
setLevel(level); } } String additivityStr = mic.subst(loggerModel.getAdditivity()); if (!OptionHelper.isNullOrEmpty(additivityStr)) { boolean additive = OptionHelper.toBoolean(additivityStr, true); addInfo("Setting additivity of logger [" + finalLoggerName + "] to " + additive); logger.set...
pattern(type: string) - A regular expression pattern to match token separators. The default is\W+, which matches non-word characters. flags(type: string) - Regular expression flags. The default is an empty string. Allowed values: CANON_EQ, CASE_INSENSITIVE, COMMENTS, DOTALL, LITERAL, MULTILI...
Integer count=menuService.deleteBatch((String[])idList.toArray()); Map<String, Object> respMap =newHashMap<>(); respMap.put("count", count); 3.原因 Arrays.asList 方法返回的是一个java.util.Arrays.ArrayList内部类实例,该类虽然跟java.util.ArrayList一样继承了java.util.AbstractList,却没有重写...
public PoolAddParameter withDisplayName(String displayName) Set the display name need not be unique and can contain any Unicode characters up to a maximum length of 1024. Parameters: displayName - the displayName value to set Returns: the PoolAddParameter object itself.with...
pattern(type: string) - A regular expression pattern to match token separators. The default is\W+, which matches non-word characters. flags(type: string) - Regular expression flags. The default is an empty string. Allowed values: CANON_EQ, CASE_INSENSITIVE, COMMENTS, DOTALL, LITERAL, MULTILI...