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下列【1】【2】【3】【4】注释标注的哪行代码有错误？import java.util.*;public class E {public static void main(String args[]) {Map map = new HashMap(); //【1】Set treeSet = new TreeSet();//【2】Map treeMap= new TreeMap(); //【3】List list = new LinkedList(); //【4】
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下列【1】【2】【3】【4】注释标注的哪行代码有错误？import java.util.*;public class E {public static void main(String args[]) {List linkedList = new LinkedList(); //【1】List arryList = new ArrayList();//【2】List stack = new Stack();//【3】List set = new TreeSet();//【4】}}
在下列代码中System.out.println的输出结果是什么？import java.util.*;public class E {public static void main(String args[]) {LinkedList< Integer> list=new LinkedList< Integer>();for(int k=1;k<=10;k++) {list.add(new Integer(k));}list.remove(5);list.remove(5);Integer m=list.get(5);System.out.println(m.intValue());}}
在下面代码中System.out.println的输出结果是什么？import java.util.*;public class Main {public static void main(String args[]) {Stack mystack1=new Stack(),mystack2=new Stack();StringBuffer bu=new StringBuffer();for(char c='A';c<='D';c++) {mystack1.push(new Character(c)); }while(!(mystack1.empty())) {Character temp=mystack1.pop();mystack2.push(temp);}while(!(mystack2.empty())) {Character temp=mystack2.pop();bu.append(temp.charValue());}System.out.println(bu);}}
激发活跃策略的2大关键因素定义为供给驱动和( )。
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