importjava.util.HashMap;importjava.util.Map;publicclassExample{publicstaticMap<String,Integer>getValues(){Map<String,Integer>values=newHashMap<>();values.put("value1",1);values.put("value2",2);values.put("value3
main = main.stream().map(m -> { m.setPet(new Pet("源pet", 5)); return m; }).collect(Collectors.toList()); // 使用stream流实现bean的深拷贝 List<Master> vice = main .stream() .map(m -> { Master temp = new Master(); BeanUtils.copyProperties(m, temp); return temp; }).col...
public class TestDemo {public static void main(String[] args) {// 赋值操作:=只能实现浅拷贝,map中的内容发生变化,copyMap中的内容亦同步发生变化Map<String, String> map = new HashMap<String, String>(1);map.put("name", "oldlu");Map<String, String> copyMap = new HashMap<String, String>...
Math.min(original.length-from, newLength));returncopy; 参数含义 (原数组,开始位置,拷贝的个数) 1 用法示例: int[] a1 = {1, 2, 3, 4, 5};int[] a2 = Arrays.copyOfRange(a1, 0, 1); System.out.println(Arrays.toString(a1))//[1, 2, 3, 4, 5]System.out.println(Arrays.toString(a2...
returnoldValue;}publicfinalbooleanequals(Objecto){if(o==this)returntrue;if(oinstanceofMap.Entry)...
}publicStringgetName(){returnname; }publicvoidsetName(String name){this.name = name; } @OverridepublicStringtoString(){returnthis.name; } @OverrideprotectedPersonclone() throws CloneNotSupportedException{return(Person) super.clone(); }publicstatic<T>List<T>deepCopy(List<T> src) ...
Java Arrays.copyOf()方法详解 该方法传回的数组是新的数组对象,改变传回数组中的元素值,不会影响原来的数组,其中第一个变量表示原来的数组对象,第二个变量表示新的数组的长度,如果新的数组的长度超过原来的数组的长度,保留数组元素的默认基本类型的值。
publicbooleanequals(Object anObject){if(this==anObject){returntrue;}if(anObjectinstanceofString){String anotherString=(String)anObject;int n=value.length;if(n==anotherString.value.length){char v1[]=value;char v2[]=anotherString.value;int i=0;while(n--!=0){if(v1[i]!=v2[i])returnfa...
* @return the map */ThreadLocalMapgetMap(Thread t){returnt.threadLocals;}/** * Create the map associated with a ThreadLocal. Overridden in * InheritableThreadLocal. * * @param t the current thread * @param firstValue value for the initial entry of the map ...
return Optional.ofNullable(programer) .filter(Objects::nonNull) .map(p->p.getName()) .orElse(null) .toUpperCase(); } 对于分不清的情况所可以使用和Spring类似的方案,就是使用qualified。例如上面的功能还可以以下面的方案实现。 @Mapping(target = "name", qualifiedByName ={"nameToUp"} ) ...