单选题现有: class Cat { Cat(int c) { System.out.print("cat" + c + " "); } } class SubCat extends Cat { SubCat(int c) { super(5); System.out.print("cable "); } SubCat() { this(4); } public static void main(String [] args) { SubCat s = new SubCat(); } } 结果为:()Acat5BcableCcable cat5Dcat5 cable
单选题
现有: class Cat { Cat(int c) { System.out.print("cat" + c + " "); } } class SubCat extends Cat { SubCat(int c) { super(5); System.out.print("cable "); } SubCat() { this(4); } public static void main(String [] args) { SubCat s = new SubCat(); } } 结果为:()
A
cat5
B
cable
C
cable cat5
D
cat5 cable
参考解析
解析:
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现有:classCat{Cat(intc){System.out.print(cat+c+);}}classSubCatextendsCat{SubCat(intc){super(5);System.out.print(cable);}SubCat(){this(4);}publicstaticvoidmain(String[]args){SubCats=newSubCat();}}结果为:()A.cat5B.cableC.cablecat5D.cat5cable
现有:classCat{Cat(intc){System.out.print{cat+c+);}}classSubCatextendsCat{SubCat(intc){super(5);System.out.print(cable);}SubCat(){this(4);}publicstaticvoidmain(String[]args){SubCats=newSubCat();}}结果为:()A.cat5B.cableC.cat5cableD.cablecat5
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以下程序调试结果为:class Base{Base(){int i = 100;System.out.print (i);}}public class Pri extends Base{static int i = 200;public static void main(String argv[]){Pri p = new Pri();System.out.print(i);}} A.编译错误B.200C.100200D.100
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
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class super { public int getLength() {return 4;} } public class Sub extends Super { public long getLength() {return 5;} public static void main (String[]args) { super sooper = new Super (); Sub sub = new Sub(); System.out.printIn( sooper.getLength()+ “,” + sub.getLength() }; } What is the output?() A、 4, 4B、 4, 5C、 5, 4D、 5, 5E、 The code will not compile.
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
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。
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class Super { public int getLenght() { return 4; } } public class Sub extends Super { public long getLenght() { return 5; } public static void main(String[] args) {Super sooper = new Super(); Sub sub = new Sub(); System.out.println( sooper.getLenght() + “,” + sub.getLenght() ); } } What is the output? ()A、 4,4B、 4,5C、 5,4D、 5,5E、 Compilation fails.
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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