单选题final class Tree { private static String tree = "tree "; String getTree() { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main(String [] args) { new Elm().go(new Tree()); } void go(Tree t) { String s = t.getTree()+Elm.tree+tree+(new Elm().getTree()); System.out.println(s); } } 结果为:()Aelm elm elm elmBtree elm elm elmCtree elm tree elmD编译失败
单选题
final class Tree { private static String tree = "tree "; String getTree() { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main(String [] args) { new Elm().go(new Tree()); } void go(Tree t) { String s = t.getTree()+Elm.tree+tree+(new Elm().getTree()); System.out.println(s); } } 结果为:()
A
elm elm elm elm
B
tree elm elm elm
C
tree elm tree elm
D
编译失败
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●Traversing a binary tree in preorder is equivalent to (68) .(68) A.Traversing the forest corresponding to the binary tree in root-first orderB.Traversing the forest corresponding to the binary tree in root-last orderC.Traversing the forest corresponding to the binary tree in breadth-first orderD.None of the above
It is believed that the tradition of having a pine tree as a Christmas Tree comes from Germany.()
finalclassTree{privatestaticStringtree=tree;StringgetTree(){returntree;}}classElmextendsTree{privatestaticStringtree=elm;publicstaticvoidmain(String[]args){newElm().go(newTree());}voidgo(Treet){Strings=t.getTree()+Elm.tree+tree+(newElm().getTree());System.out.println(s);}}结果为:()A.elmelmelmelmB.treeelmelmelmC.treeelmtreeelmD.编译失败
现有:classTree{privatestaticStringtree=tree;StringgetTree(){returntree;}}classElmextendsTree{privatestaticStringtree=elm;publicstaticvoidmain(String[]args){newElm().go(newTree());}}voidgo(Treet){Strings=t.getTree()+Elm.tree+tree+(newElm().getTree());System.out.println(s);}结果为:()
阅读以下说明和C语言函数,将应填入(n)处的语句写在对应栏内。【说明】本程序利用非递归算法实现二叉树后序遍历。【函数】include<stdio.h>include<stdlib.h>typedef struct node{/*二叉树的结点数据结构类型*/char data;struct node *left;struct node *right;}BTREE;void SortTreelnsert(BTREE **tree, BTREE *s){if(*tree==NULL)*tree=s;elseif(s->data<(*tree)->data)SortTreelnsert((1),s);else if(s->data>=(*tree)->data)SortTreelnsert((2),s);}void TraversalTree(BTREE *tree){BTREE *stack[1 000],*p;int tag[1000],top=0;p=tree;do{while(p !=NULL){stack[++top]=p;(3);tag[top]=0; /*标记栈顶结点的左子树已进行过后序遍历*/}while(top>0(4))/*栈顶结点的右子树是否被后序遍历过*/{p=stack[top--];putchar(p->data);}if(top>0)/*对栈顶结点的右子树进行后序遍历*/{(5);tag[top]=1;}}while(top>0);}void PrintSortTree(BTREE *tree){if(tree !=NULL){printSortTree(tree->left);putchar(tree->data);pdntSortTree(tree->right);}}main(){BTREE *root=NULL, *node;char ch;ch=getchar();while(ch !=''){node=(BTREE*)malloc(sizeof(BTREE));node->data=ch;node->left=node->right=NULL;SortTreelnsert(root, node);ch=getchar();}PrintSortTree(root);putchar('\n');TraversalTree(root);}
下面程序段的输出结果为 public class Test { public static void main(String args[]) { boolean a,b,c; a=(35); b=(a==true); System.out.println(”a=”+a+”b=+b) ; c=(b==false); System.out.printhln(”b=”+b+”c=”+c) ; } }A.a=true b=false b=true c=falseB.a=true b=false b=true c=trueC.a=true b=true b=tree c=falseD.a=false b=false b=tree c=false
Traversing a binary tree in preorder is equivalent to(68).A.Traversing the forest corresponding to the binary tree in root-first orderB.Traversing the forest corresponding to the binary tree in root-last orderC.Traversing the forest corresponding to the binary tree in breadth-first orderD.None of the above
考虑如下代码:class Tree{}class Pine extends Tree{}class Oak extends Tree{}public class Forest {public static void main( String[] args ) {Tree tree = new Pine();if( tree instanceof Pine )System.out.println( "Pine" );if( tree instanceof Tree )System.out.println( "Tree" );if( tree instanceof Oak )System.out.println( "Oak" );elseSystem.out.println( "Oops" );}}则输出结果中有哪些?A.Pine B.Tree C.Forest D.Oops E.无输出
Which command enhances the 802.1D convergence time on ports that are connected to hosts?() A. spanning-tree backbonefastB. spanning-tree uplinkfastC. spanning-tree portfastD. spanning-tree cost512
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What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations?()A、immediately after receiving the first packet on the shared tree for a given (S,G)B、after receiving over 1 kb/s traffic onthe shared tree for a given (S,G)C、10 seconds after receiving the first packet on the shared tree for a given (S,G)D、30 seconds after receiving the first packet on the shared tree for a given (S,G)E、after receiving over 10 kb/s traffic onthe shared tree for a given (S,G)
现有: class Tree { private static String tree = "tree "; String getTree () { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main (String [] args) { new Elm() .go (new Tree()) ; } } void go (Tree t) { String s = t.getTree () +Elm.tree + tree + (new Elm() .getTree ()) ; System.out.println (s) ;} 结果为:() A、 elm elm elm elmB、 tree elm elm elmC、 tree elm elm treeD、 tree elm tree elm
Which command enables RSTP on a switch?()A、spanning-tree mode rapid-pvstB、spanning-tree uplinkfastC、spanning-tree backbonefastD、spanning-tree mode mst
Which command enhances the 802.1D convergence time on ports that are connected to hosts?()A、spanning-tree backbonefastB、spanning-tree uplinkfastC、spanning-tree portfastD、spanning-tree cost512
final class Tree { private static String tree = "tree "; String getTree() { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main(String [] args) { new Elm().go(new Tree()); } void go(Tree t) { String s = t.getTree()+Elm.tree+tree+(new Elm().getTree()); System.out.println(s); } } 结果为:() A、elm elm elm elmB、tree elm elm elmC、tree elm tree elmD、编译失败
public class Plant { private String name; public Plant(String name) { this.name = name; } public String getName() { return name; } } public class Tree extends Plant { public void growFruit() { } public void dropLeaves() { } } Which is true?() A、 The code will compile without changes.B、 The code will compile if public Tree() { Plant(); } is added to the Tree class.C、 The code will compile if public Plant() { Tree(); } is added to the Plant class.D、 The code will compile if public Plant() { this(”fern”); } is added to the Plant class.E、 The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.
import java.io.*; public class Forest implements Serializable { private Tree tree = new Tree(); public static void main(String [] args) { Forest f= new Forest(); try { FileOutputStream fs = new FileOutputStream(”Forest.ser”); ObjectOutputStream os = new ObjectOutputStream(fs); os.writeObject(f); os.close(); } catch (Exception ex) { ex.printStackTrace(); } } } class Tree { } What is the result?() A、 Compilation fails.B、 An exception is thrown at runtime.C、 An instance of Forest is serialized.D、 A instance of Forest and an instance of Tree are both serialized.
单选题哪个命令可以在交换机启用RSTP? ()A spanning-tree mode rapid-pvstB spanning-tree uplinkfastC spanning-tree backbonefastD spanning-tree mode mst
单选题Which spanning-tree command would cause a PortFast-enabled interface to lose its PortFast-operational status and disable BPDU filtering if it receives BPDUs?()Aspanning-tree guard rootBspanning-tree portfast bpduguard defaultCspanning-tree bpduguard enableDspanning-tree bpdufilter enableEspanning-tree portfast bpdufilter default
单选题现有: class Tree { private static String tree = "tree "; String getTree () { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main (String [] args) { new Elm() .go (new Tree()) ; } } void go (Tree t) { String s = t.getTree () +Elm.tree + tree + (new Elm() .getTree ()) ; System.out.println (s) ;} 结果为:()A elm elm elm elmB tree elm elm elmC tree elm elm treeD tree elm tree elm
单选题import java.io.*; public class Forest implements Serializable { private Tree tree = new Tree(); public static void main(String [] args) { Forest f= new Forest(); try { FileOutputStream fs = new FileOutputStream(”Forest.ser”); ObjectOutputStream os = new ObjectOutputStream(fs); os.writeObject(f); os.close(); } catch (Exception ex) { ex.printStackTrace(); } } } class Tree { } What is the result?()A Compilation fails.B An exception is thrown at runtime.C An instance of Forest is serialized.D A instance of Forest and an instance of Tree are both serialized.
单选题public class Plant { private String name; public Plant(String name) { this.name = name; } public String getName() { return name; } } public class Tree extends Plant { public void growFruit() { } public void dropLeaves() { } } Which is true?()A The code will compile without changes.B The code will compile if public Tree() { Plant(); } is added to the Tree class.C The code will compile if public Plant() { Tree(); } is added to the Plant class.D The code will compile if public Plant() { this(”fern”); } is added to the Plant class.E The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.
单选题Which command enables RSTP on a switch?()Aspanning-tree mode rapid-pvstBspanning-tree uplinkfastCspanning-tree backbonefastDspanning-tree mode mst
单选题final class Tree { private static String tree = "tree "; String getTree() { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main(String [] args) { new Elm().go(new Tree()); } void go(Tree t) { String s = t.getTree()+Elm.tree+tree+(new Elm().getTree()); System.out.println(s); } } 结果为:()Aelm elm elm elmBtree elm elm elmCtree elm tree elmD编译失败
单选题What is the Cisco IOS default behavior for switching from the shared tree to the shortest path tree in PIM-SM operations?()Aimmediately after receiving the first packet on the shared tree for a given (S,G)Bafter receiving over 1 kb/s traffic onthe shared tree for a given (S,G)C10 seconds after receiving the first packet on the shared tree for a given (S,G)D30 seconds after receiving the first packet on the shared tree for a given (S,G)Eafter receiving over 10 kb/s traffic onthe shared tree for a given (S,G)