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import  java.io.*;

public class TypeTransition{

public static void main(String args[]){

char a = 'h';

int i = 100;

int j = 97;

int aa = a + i;

System.out.println("aa="+aa);

char bb = (char)j;

System.out.println("bb="+bb);

}

}

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A£©aa=I B£©aa=204   C£©aa=v D£©aa=156

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public class OperatorsAndExpressions {

void equalsMethod1(){

String s1=new String("how are you");

String s2=new String("how are you");

System.out.println(s1==s2);

}

public static void main(String args[]){

OperatorsAndExpressions OperAndExp=new OperatorsAndExpressions();

//ÓÃÓÚ¸´ºÏÀàÐÍÊý¾ÝµÄ“£½£½”ÔËËã·û

OperAndExp. equalsMethod1();

}

}

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if(x==0){System.out.println("¹Ú¾ü");}

else if (x>-3){System.out.println("ÑǾü");}

else { System.out.println("¼¾¾ü");}

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import javax.swing.JOptionPane;

public class Comparison {

public static void main( String args[] ){

String firstNumber,    //Óû§ÊäÈëµÚ1¸öÊý¾Ý±äÁ¿

secondNumber,  //Óû§ÊäÈëµÚ2¸öÊý¾Ý±äÁ¿

result;         //Êä³ö½á¹û±äÁ¿

int number1,         //ÓÃÓڱȽϵĵÚ1¸öÊý

number2;         //ÓÃÓڱȽϵĵÚ2¸öÊý

//Óû§ÊäÈëµÚ1¸öÊý¾ÝµÄ×Ö·û´®

firstNumber = JOptionPane.showInputDialog( "ÊäÈëµÚ1¸öÕûÊý:" );

//Óû§ÊäÈëµÚ2¸öÊý¾ÝµÄ×Ö·û´®

secondNumber = JOptionPane.showInputDialog( "ÊäÈëµÚ2¸öÕûÊý:" );

//½«×Ö·û´®×ª»»ÎªÕûÊýÀàÐÍ

number1 = Integer.parseInt( firstNumber );

number2 = Integer.parseInt( secondNumber );

//³õʼ»¯½á¹û±äÁ¿

______________________;

//±È½ÏÁ½¸öÊý¾Ý

if ( number1 == number2 )

result += number1 + " == " + number2;

if ( number1 != number2 )

result += number1 + " != " + number2;

if ( number1 < number2 )

result = result + "\n" + number1 + " < " + number2;

if ( number1 > number2 )

result = result + "\n" + number1 + " > " + number2;

if ( number1 <= number2 )

result = result + "\n" + number1 + " <= " + number2;

if ( number1 >= number2 )

result = result + "\n" + number1 + " >= " + number2;

//ÏÔʾ½á¹û

JOptionPane.showMessageDialog(null,result,"±È½Ï½á¹û",

JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );

}

}

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A£©result = ""      B£©result = null

C£©result = number1     D£©result = number2

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public class Increment {

public static void main( String args[] ){

int c;

c = 5;

System.out.println( c );

System.out.println( c++ );

System.out.println( c );

}

}

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A£©5  B£©5    C£©6    D£©6

6   5                  7         6

6   6   7        6

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B£©Í¨³£Çé¿öÏÂJava ApplicationÖ»ÄÜÓÐÒ»¸ömain()·½·¨

C£©Java Applet±ØÐëÓÐHTMLÎļþ²ÅÄÜÔËÐÐ

D£©Java Applet³ÌÐòµÄ.classÎļþ¿ÉÓÃjavaÃüÁîÔËÐÐ

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import javax.swing.JOptionPane;

public class BreakLabelTest {

public static void main( String args[] ){

String output = "";

stop: {

for ( int row = 1; row <= 10; row++ ) {

for ( int column = 1; column <= 5 ; column++ ) {

if ( row == 5 )

break stop;

output += "*  ";

}

output += "\n";

}

output += "\nLoops terminated normally";

}

JOptionPane.showMessageDialog(

null, output,"ÓÃÒ»¸ö±êÖ¾²âÊÔbreakÓï¾ä",

JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );

}

}

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B£©´°¿ÚÖÐÓÐ5ÐÐ* * * *

C£©´°¿ÚÖÐÓÐ4ÐÐ* * * * *

D£©´°¿ÚÖÐÓÐ6ÐÐ* * * * *

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1  public class Try extends Thread{

2      public static void main(String args[ ]){

3       Try t = new Try( );

4       t.start( );

5  }

6

7     public void run( int j){

8        int i = 0;

9       while(i<5){

10          System.out.println("×£Äã³É¹¦£¡");

11              i++;

12      }

13    }

14  }

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B£©½«µÚ3ÐеÄnew Try()¸ÄΪnew Thread()

C£©½«µÚ4ÐÐt.start()¸ÄΪstart(t)

D£©½«µÚ7ÐеÄpublic void  run( int j) ¸ÄΪpublic void  run()

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public class Test2{

public static void main(String args[]){

System.out.println(5/2);}}

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int x=3;

while (x<9)

x+=2;

x++;

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public class ThrowableException{

public static void main(String args[]){

try{

throw new Throwable("ÕâÀïÊDZ¾È˶¨ÒåµÄÒì³£");

}catch(Throwable e){

System.out.println("Caught Throwable");

System.out.println("e.getMessage(): "+e.getMessage());

System.out.println("e.toString(): "+e.toString());

System.out.println("e.printStackTrace(): ");

¡¾11¡¿  ;}}}

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