public class J_Test｛ 

public static void mb_method(String s,StringBuffer t)｛ 

s=s.replace(＇j＇，＇i＇)； 

t=t.append(＂c＂); 

｝  

public static void main(String args[])｛ 

String a=new String(＂java＂); 

StringBuffer b=new StringBuffer(＂java＂); 

mb_method(a,b); 

System.out.println(a+b); 

｝  

｝ 

阅读下面程序写出输出结果。

int  s;

for( int k=5;k<=10;k++) {

s=0;

for(int m=1;m<k;m++)

   if(k % m==0)

     s=s+m;

if(s==k)

  System.out.print(k + “  ”);

}

在下面的程序编译之后，按“java J＿Test 1 2 3”方式运行的结果是：

public class J_Test｛

public static void main(String args［ ］)｛

int i；

for(i=0;i<args.length;i++)｛

System.out.print(＂args［＂+i+＂］=＂+args［i］+＂;＂);

｝

｝

｝

public class Example { 

public static void main(String []args){ 

try{ 

callMethod(); 

}catch(Exception e){ 

System.out.print('a'); 

} 

System.out.println('b'); 

}   

static void createException(){ 

throw new IndexOutOfBoundsException(); 

}   

static void callMethod(){ 

try{ 

createException(); 

System.out.print('c'); 

}catch(ArrayIndexOutOfBoundsException e){ 

            System.out.print('d'); 

        }finally{ 

System.out.print('e'); 

} 

    System.out.print('f'); 

} 

} 

public class Test{  

public static void main(String args[ ]){  

int i , j ;  

int a[ ] = { 56,12,23,124,100 };  

for ( i = 0 ; i < a.length-1; i ++ ) {  

int k = i;  

for ( j = i ; j < a.length ; j++ )  

if ( a[j]<a[k] ) k = j;  

int temp =a[i];  

a[i] = a[k];  

a[k] = temp;  

}  

for ( i =0 ; i<a.length; i++ )  

System.out.print(a[i]+" ");  

System.out.println( );  

}  

} 

C:\ Program Files is a directory。 

public class Test { 

public static void main(String[] args){ 

File myDir = new File("c:/Program Files"); 

System.out.println(myDir+myDir.isDirectory()?"is":"isnot"+"a. 

directory"); 

} 

} 

 class test {  

public static void main(String[] arg){  

int a=1,b=6,c=4,d=2;  

switch (a++) {  

case 1: c++; d++;  

case 2: switch (++b) { 

           case 7: c++; 

           case 8: d++; 

   }  

case 3: c++; d++; break;  

case 4: c++; d++;  

}  

System.out.println(a+","+b+","+c+","+d);  

}  

} 

       public Person(){  

            System.out.println("hi!");  

       }  

       public Person(String s){  

            this();  

            System.out.println("I am "+s);  

       }  

} 

public class Who extends Person{  

       public Who(){  

             this("I am Tony");  

       }  

       public Who(String s){  

             super(s);  

             System.out.println("How do you do?");  

       }  

       public static void main(String args[]){  

             Who w = new Who("Tom");  

       } 

} 

  Object find(String name); 

} 

class LookupProduct implements Lookup{ 

  private String[] productNames={"Cloth","Bike","Car"}; 

  private  Object[]  productPrices={new  Integer(100),new  Integer(200),new 

Integer(300)}; 

  LookupProduct(){  } 

  public Object find(String name){ 

    for(int i=0;i <productNames.length;i++) 

      if(productNames[i].equals(name)) 

        return productPrices[i]; 

    return null; 

  } 

} 

public class LookupDemo{ 

  public void processValues(String[] name,Lookup table){ 

    for(int i=0;i<name.length;i++){ 

      Object value = table.find(name[i]); 

      if(value != null) 

        System.out.println("Product "+name[i]+" Price="+ value); 

       } 

  } 

  public static void main(String[] args){ 

    String[] productArray = {"bike","Car","Paper"}; 

    LookupProduct lp = new LookupProduct(); 

    new LookupDemo().processValues(productArray,lp); 

  } 

public static void main(String args［ ］)｛ 

int i=0; 

try｛ 

for(i=0;i<10;i++)｛ 

try｛ 

if(i&3==0) 

throw new Exception( ）; 

System.out.print(＂1:＂+i+＂,＂); 

｝catch(Exception e2)｛ 

System.out.print(＂2:＂+i+＂,＂); 

i+=2; 

if(i%3==2) 

throw new Exception( ）; 

return; 

｝finally｛ 

i*=2; 

System.out.print(＂3:＂+i+＂,＂); 

｝ 

｝ 

｝catch(Exception e2)｝System.out.print(＂4:＂+i+＂,＂); 

return; 

｝finally｛ 

System.out.print(＂5:＂+i+＂,＂); 

｝System.out.println(＂End!＂); 

｝ 

｝ 

class Parent { 

    public void count() { 

       System.out.println(10%3); 

    } 

} 

public class Child    extends Parent{ 

    public void count() { 

       System.out.println(10/3); 

    } 

    public static void main(String args[]) { 

       Parent p = new Child(); 

       p.count(); 

    } 

} 

int [] a={6,5,4,1,2,3}; 

        int i ,j; 

        for(i=0,j=5;i<j;i++,j--) 

                a[i]=a[j]+a[j]; 

        for(i=0;i<6;i++) 

System.out.print(a[i]+” ”); 

char k=’B’, p=’F’; 

int data = p-k; 

System.out.println(“ ”+data );