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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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更多 “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 elmB tree elm elm elmC tree elm tree elmD 编译失败” 相关考题
考题
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
考题
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:()
考题
下面程序的运行结果是( )。 public class OperatorsAndExpressions{ void equalsMethod1( ){ //基本类型的数据之间的比较 int i=10,j=15; System.out,println(i==j); //复合数据类型的数据之间的比较 String s1=new String ("how are you"); String s2=new String ("how are you"); System.out.println(s1==s2): } public static void main (String args[ ]){ OperatorsAndExpressions OperAndExp=new OperatorsAndExpressions( ): //用于基本类型数据和复合类型数据的=="运算符 OperAndExp,equalsMethod1( ) } }A.false falseB.false trueC.tree falseD.true true
考题
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
考题
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
考题
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
考题
Which declarations will allow a class to be started as a standalone program?() A、public void main(String args[])B、public void static main(String args[])C、public static main(String[] argv)D、final public static void main(String [] array)E、public static void main(String args[])
考题
class BitStuff { BitStuff go() { System.out.print("bits "); return this; } } class MoreBits extends BitStuff { MoreBits go() { System.out.print("more "); return this; } public static void main(String [] args) { BitStuff [] bs = {new BitStuff(), new MoreBits()}; for( BitStuff b : bs) b.go(); } } 结果为:() A、bits bitsB、bits moreC、more moreD、编译失败
考题
class Mineral { static String shiny() { return "1"; } } class Granite extends Mineral { public static void main(String [] args) { String s = shiny() + getShiny(); s = s + super.shiny(); System.out.println(s); } static String getShiny() { return shiny(); } } 结果为:() A、3B、12C、111D、编译失败
考题
public class Item { private String desc; public String getDescription() { return desc; } public void setDescription(String d) { desc = d; } public static void modifyDesc(Item item, String desc) { item = new Item(); item.setDescription(desc); } public static void main(String[] args) { Item it = new Item(); it.setDescription(”Gobstopper”); Item it2 = new Item(); it2.setDescription(”Fizzylifting”); modifyDesc(it, “Scrumdiddlyumptious”); System.out.println(it.getDescription()); System.out.println(it2.getDescription()); } } What is the outcome of the code? ()A、 Compilation fails.B、 Gobstopper FizzyliftingC、 Gobstopper ScrumdiddlyumptiousD、 Scrumdiddlyumptious FizzylifltngE、 Scrumdiddlyumptious Scrumdiddlyumptious
考题
下面哪些选项是正确的main方法说明?()A、 public main(String args[])B、 public static void main(String args[])C、 private static void main(String args[])D、 void main()
考题
声明Java独立应用程序main()方法时,正确表达是()。A、public static void main(String[]args){…}B、private static void main(String args[]){…}C、public void main(String args[]){…}D、public static void main(){…}
考题
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 elmB、tree elm elm elmC、tree elm tree elmD、编译失败
考题
class Passer { static final int x = 5; public static void main(String [] args) { new Passer().go(x); System.out.print(x); } void go(int x) { System.out.print(++x); } } 结果是什么?() A、55B、56C、65D、66
考题
Public class test ( Public static void stringReplace (String text) ( Text = text.replace (‘j’ , ‘i’); ) public static void bufferReplace (StringBuffer text) ( text = text.append (“C”) ) public static void main (String args[]} ( String textString = new String (“java”); StringBuffer text BufferString = new StringBuffer (“java”); stringReplace (textString); bufferReplace (textBuffer); System.out.printLn (textString + textBuffer); ) ) What is the output?()
考题
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.
考题
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.
考题
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 elmB
tree elm elm elmC
tree elm tree elmD
编译失败
考题
填空题Public class test ( Public static void stringReplace (String text) ( Text = text.replace (‘j’ , ‘i’); ) public static void bufferReplace (StringBuffer text) ( text = text.append (“C”) ) public static void main (String args[]} ( String textString = new String (“java”); StringBuffer text BufferString = new StringBuffer (“java”); stringReplace (textString); BufferReplace (textBuffer); System.out.printLn (textString + textBuffer); ) ) What is the output?()
考题
单选题public class Item { private String desc; public String getDescription() { return desc; } public void setDescription(String d) { desc = d; } public static void modifyDesc(Item item, String desc) { item = new Item(); item.setDescription(desc); } public static void main(String[] args) { Item it = new Item(); it.setDescription(”Gobstopper”); Item it2 = new Item(); it2.setDescription(”Fizzylifting”); modifyDesc(it, “Scrumdiddlyumptious”); System.out.println(it.getDescription()); System.out.println(it2.getDescription()); } } What is the outcome of the code? ()A
Compilation fails.B
Gobstopper FizzyliftingC
Gobstopper ScrumdiddlyumptiousD
Scrumdiddlyumptious FizzylifltngE
Scrumdiddlyumptious Scrumdiddlyumptious
考题
多选题Which declarations will allow a class to be started as a standalone program?()Apublic void main(String args[])Bpublic void static main(String args[])Cpublic static main(String[] argv)Dfinal public static void main(String [] array)Epublic static void main(String args[])
考题
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.
考题
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.
考题
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
考题
单选题class Passer { static final int x = 5; public static void main(String [] args) { new Passer().go(x); System.out.print(x); } void go(int x) { System.out.print(++x); } } 结果是什么?()A
55B
56C
65D
66
考题
单选题class Mineral { static String shiny() { return "1"; } } class Granite extends Mineral { public static void main(String [] args) { String s = shiny() + getShiny(); s = s + super.shiny(); System.out.println(s); } static String getShiny() { return shiny(); } } 结果为:()A
3B
12C
111D
编译失败
考题
单选题class BitStuff { BitStuff go() { System.out.print("bits "); return this; } } class MoreBits extends BitStuff { MoreBits go() { System.out.print("more "); return this; } public static void main(String [] args) { BitStuff [] bs = {new BitStuff(), new MoreBits()}; for( BitStuff b : bs) b.go(); } } 结果为:()A
bits bitsB
bits moreC
more moreD
编译失败
考题
单选题下面哪些选项是正确的main方法说明?()A
public main(String args[])B
public static void main(String args[])C
private static void main(String args[])D
void main()
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