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:()Abits bitsBbits moreCmore moreD编译失败
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 bits
B
bits more
C
more more
D
编译失败
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classBitStuff{BitStuffgo(){System.out.print(bits);returnthis;}}classMoreBitsextendsBitStuff{MoreBitsgo(){System.out.print(more);returnthis;}publicstaticvoidmain(String[]args){BitStuff[]bs={newBitStuff(),newMoreBits()};for(BitStuffb:bs)b.go();}}结果为:()A.bitsbitsB.bitsmoreC.moremoreD.编译失败
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
public class Base { public static final String FOO = “foo”; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); System.out.print(Sub.FOO); System.out.print(b.FOO); System.out.print(s.FOO); System.out.print(((Base)s).FOO); } } class Sub extends Base {public static final String FOO=bar;} What is the result?() A、 foofoofoofoofooB、 foobarfoobarbarC、 foobarfoofoofooD、 foobarfoobarfooE、 barbarbarbarbarF、 foofoofoobarbarG、 foofoofoobarfoo
现有: class Parser (类)extends(继承) Utils { public static void main(String [] args) { System.out.print(输出打印)(new Parser().getInt("42")); } int getInt(String arg) { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) throws Exception { return 42; } } 结果为:() A、 42B、 编译失败。C、 无输出结果。D、 运行时异常被抛出。
现有 class Parser extends Utils { public static void main (String [] args) { try { System.out.print (new Parser () .getlnt ("42")) } catch (Exception e) { System.out.println ("Exc") ; } } int getlnt (String arg) throws Exception { return Integer.parselnt (arg) ; } } class Utils { int getlnt () { return 42; } } 结果是什么?() A、 42ExcB、 ExcC、 42D、编译失败
class Flibitz { public static void main(String [] args) { int grop = 7; new Flibitz().go(grop); System.out.print(grop); } void go(int grop) { if(++grop 〉 7) grop++; System.out.print(grop); } } 结果为:() A、77B、79C、97D、99
class Guy{String greet(){return “hi“}} class Cowboy extends Guy {String greet(){return“howdy”}} class Surfer extends Guy {String greet(){return“dudel”}} class Greetings{ public static void main (string[]args){ Guy[] guy= {new Guy(),new Cowboy(),new Surfer()}; for(Guy 0: guys) System.out.print(g.green()); } } 结果为: A、运行时异常被输出B、第7行出现一个错误,编译失败C、第8行出现一个错误,编译失败D、hi hi hiE、hi hawdy doude
class Bird { static void talk() { System.out.print("chirp "); } } class Parrot extends Bird { static void talk() { System.out.print("hello "); } public static void main(String [] args) { Bird [] birds = {new Bird(), new Parrot()}; for( Bird b : birds) b.talk(); } } 结果为:() A、chirp chirpB、chirp helloC、hello helloD、编译失败
现有: class Guy {String greet() {return "hi"; } } class Cowboy extends Guy ( String greet() ( return "howdy ¨; ) ) class Surfer extends Guy (String greet() (return "dude! ";)) class Greetings { public static void main (String [] args) { Guy [] guys = ( new Guy(), new Cowboy(), new Surfer() ); for (Guy g: guys) System.out.print (g.greet()}; } } 结果为:() A、 hi howdy dude!B、运行时异常被抛出。C、第7行出现一个错误,编译失败。D、第8行出现一个错误,编译失败。
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
class Parser extends Utils { public static void main (String [] args) { try { System.out.print(new Parser().getInt("42")); } catch (NumberFormatException n) { System.out.println("NFExc "); } } int getInt(String arg) throws NumberFormatException { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) { return 42; } } 结果为:() A、42B、NFExcC、42NFExcD、编译失败
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
class Base { Base() { System.out.print(“Base”); } } public class Alpha extends Base { public static void main( String[] args ) { new Alpha(); new Base(); } } What is the result?() A、 BaseB、 BaseBaseC、 Compilation fails.D、 The code runs with no output.E、 An exception is thrown at runtime.
class Parser extends Utils { public static void main(String [] args) { System.out.print(new Parser().getInt("42")); } int getInt(String arg) { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) throws Exception { return 42; } } 结果为:() A、42B、编译失败C、无输出结果D、运行时异常被抛出
单选题现有: class Parser extends Utils { public static void main(String [] args) { System.out.print(new Parser().getInt("42")); } int getInt(String arg) { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) throws Exception { return 42; } } 结果为()A 42B 编译失败。C 无输出结果。D 运行时异常被抛出。
单选题现有: class Parser extends Utils { public static void main (String[] args) { try{System.out.print (new Parser().getlnt("42")); } catch (Exception e) { System.out.println("Exc"); } } int getlnt (String arg) throws Exception { return Integer.parselnt (arg); } class Utils { int getlnt (String arg) {return 42; } } 结果为()A 42B ExcC 42ExcD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:()Aelm elm elm elmBtree elm elm elmCtree elm tree elmD编译失败
单选题class Base { Base() { System.out.print(“Base”); } } public class Alpha extends Base { public static void main( String[] args ) { new Alpha(); new Base(); } } What is the result?()A BaseB BaseBaseC Compilation fails.D The code runs with no output.E An exception is thrown at runtime.
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class Bird { static void talk() { System.out.print("chirp "); } } class Parrot extends Bird { static void talk() { System.out.print("hello "); } public static void main(String [] args) { Bird [] birds = {new Bird(), new Parrot()}; for( Bird b : birds) b.talk(); } } 结果为:()Achirp chirpBchirp helloChello helloD编译失败
单选题class Flibitz { public static void main(String [] args) { int grop = 7; new Flibitz().go(grop); System.out.print(grop); } void go(int grop) { if(++grop 〉 7) grop++; System.out.print(grop); } } 结果为:()A77B79C97D99
单选题下列程序的运行结果是( )。class Shape{ public Shape(){ System.out.print("Shape"); }}class Circle extends Shape{ public Circle(){ System.out.print("Circle"); }}public class Test{ public static void main(String[]args){ Shape d=new Circle(); }}AShapeBCircleCShapeCircleD程序有错误
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?()A55B56C65D66
单选题现有: class Guy {String greet() {return "hi"; } } class Cowboy extends Guy ( String greet() ( return "howdy ¨; ) ) class Surfer extends Guy (String greet() (return "dude! ";)) class Greetings { public static void main (String [] args) { Guy [] guys = ( new Guy(), new Cowboy(), new Surfer() ); for (Guy g: guys) System.out.print (g.greet()}; } } 结果为:()A hi howdy dude!B运行时异常被抛出。C第7行出现一个错误,编译失败。D第8行出现一个错误,编译失败。
单选题现有 class Parser extends Utils { public static void main (String [] args) { try { System.out.print (new Parser () .getlnt ("42")) } catch (Exception e) { System.out.println ("Exc") ; } } int getlnt (String arg) throws Exception { return Integer.parselnt (arg) ; } } class Utils { int getlnt () { return 42; } } 结果是什么?()A 42ExcB ExcC 42D编译失败
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:()Abits bitsBbits moreCmore moreD编译失败
单选题public class Base { public static final String FOO = “foo”; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); System.out.print(Sub.FOO); System.out.print(b.FOO); System.out.print(s.FOO); System.out.print(((Base)s).FOO); } } class Sub extends Base {public static final String FOO=bar;} What is the result?()A foofoofoofoofooB foobarfoobarbarC foobarfoofoofooD foobarfoobarfooE barbarbarbarbarF foofoofoobarbarG foofoofoobarfoo
单选题class Guy { String greet() { return "hi "; } } class Cowboy extends Guy { String greet() { return "howdy "; } } class Wrangler extends Cowboy { String greet() { return "ouch! "; } } class Greetings2 { public static void main(String [] args) { Guy g = new Wrangler(); Guy g2 = new Cowboy(); Wrangler w2 = new Wrangler(); System.out.print(g.greet()+g2.greet()+w2.greet()); } } 结果是什么?()Ahi hi ouch!Bhi howdy ouch!Couch! howdy ouch!D编译失败