publicclassA1{publicA1(){System.out.println(hello);}}publicclassA2extendsA1{publicA2(){System.out.println(world);}}publicclassA3extendsA2{publicA3(){System.out.println(china);}}publicclassB{publicstaticvoidmain(String[]args){A1 ৠቹ ቹ뗐敔 敔ৠቹ�敘ৠቹﲘǛ瘓鞸ி
举一反三
- 请看下面的程序代码,当 n 为( )值时,程序段将输出字符串 second。 [br][/br] switch(n) { [br][/br] case 0: System .out .println(“first”); [br][/br] case 1: [br][/br] case 2: System .out .println(“second”); break; [br][/br] default: System .out .println(“end”); [br][/br] }(2.0) A: 0 B: 1 C: 2 D: 以上都可以
- publicclassA{publicdoublefunc1(inti,intj){returni+j;}publicdoublefunc1(doublei,doublej){returni+j+10;}publicdoublefunc1(floati,floatj){returni+j+20;}publicdoublefunc1(longi,longj){returni+j+30;}}publicclassB ৠቹ ቹ뗐敔 敔ৠቹ�敘ৠቹﲘǛ瘓轸ி 㰰ǚ 㰰ǚ ብ盂ீЀ 痰ብ盂 Ѐ 㰰ǚ睽Ԝ盜Љ 䕄Ȓ ୰ቹء盜 ᤀ 澈ঝ
- 中国大学MOOC: 下列代码中构造方法的返回类型是（）public class Village { Village () { System .out .println(“hiding in Village”) ; } public static void main( String args [ ]) { Village c =new Village ( ) ;}class Village { public static void main( String args [ ]) { Village c =new Village ( ) ; } Village () { System .out .println(“hiding in Village”) ; } }
- Test类的定义如下：publicclassTest{publicTest(){System.out.println(构造方法一被调用了。。);}publicTest(intx){System.out.println(构造方法二被调用了。。);}publicTest(booleanb){System.out.println(构造方法三被调用了。。);}publicstaticvoidmain(String[]args){Testtest=newTest(true);}}௲ 垎 뗐敔 敔垎�敘垎
- publicclassA1{publicdoublefunc1(doublei,doublej){returni+j;}}publicclassA2extendsA1{publicdoublefunc1(doublei,doublej){returni+j+10;}}publicclassA3extendsA2{publicdoublefunc1(doublei,doublej){returni+j+20;}}publ ৠቹ ቹ뗐敔 敔ৠቹ�敘ৠቹﲘǛ瘓轸ி 㰰ǚ 㰰ǚ ብ盂ீЀ 痰ብ盂 Ѐ 㰰ǚ睽Ԝ盜Љ 䕄Ȓ ୰ቹء盜 ᤀ 澈ঝ ꋔȒ ᩄ ᬜ摐൰