java期末复习题（一）

System.out.println(\ }

public void showMe(){

System.out.println(\ } }

public class Class3{

public static void main(String args[]){

InterfaceTest myObject=new InterfaceTest(); myObject.showX(); myObject.showY(); myObject.showMe(); } }

运行结果为： x=1 y=2 z=6

（4）

public class Class4{ static String s;

public static void main(String[] args){ System.out.println(“s= ”+s);

} }

运行结果为： s=null （5）

public static void main(String[] args){

int j=10;

int i=1;

do{ if(i++>--j) continue; }while(i<5) }

运行结果为： i=5 j=6 （6）

import java.io.* ; public class Class6{

public static void main(String args[ ]){

int i, s = 0 ;

int a[ ] = { 10 , 20 , 30 , 40 , 50 , 60 , 70 , 80 , 90 }; for ( i = 0 ; i < a.length ; i ++ ) if ( a[i]%3 = = 0 ) s += a[i] ;

System.out.println(\ }

}

运行结果为： s = 180 （7）

class Class7 {

public static void main(String[] args){

char myChar='c'; switch(myChar){ default:

case 'a':System.out.println(\ case 'b':System.out.println(\ } }

}

运行结果为：a (8)

class Class8 int var;

Tester(double var) { this.var = (int)var; }

Tester(int var) { this(\ }

Tester(String s) { this();

System.out.print (s); }

Tester() {

System.out.print(\ }

public static void main(String[] args) { Tester t = new Tester(5); }

}

运行结果为：goodbye hello

(9)

public class Person {

String name; int age; public Person(String name, int age) { this.name = name; this.age = age; } public static void main(String[] args) { Person c = new Person(\

System.out.println(c.name + \ } }

运行结果为：Peter is 17 years old! （10）

public class Class10 {

public static void main(String args[]) { int x = 10, y = 0; for(int i=2;i

switch(y) {

case 0: System.out.print(0);

case 1: System.out.print(1);break; case 2: System.out.print(2); case 3: System.out.print(3);break; default: System.out.print(4); } } }

运行结果为：23

（11）

class Person{

public Person(){

System.out.println(\ }

public Person(String s){ this();

System.out.println(\ } }

public class Class11 extends Person{ public Class11(){ this(\ }

public Class11(String s){ super(s);

System.out.println(\ }

public static void main(String args[]){ Class11 w = new Class11(\ } }

运行结果为： hi

I am Tony

How do you do? (12)

public class Class12{

String str=new String(\ char ch[]={'J','a','v', 'a'};

public static void main(String args[]){ Class12 ex=new Class12(); ex.change(ex.str,ex.ch); System.out.println(ex.str);

System.out.println(new String(ex.ch)); }

public void change(String str,char ch[]){ str=\ ch[0]= 'Y'; } }

运行结果为： Hello Yava