Dibawah ini adalah beberapa program Latihan Bahasa JAVA untuk time practice yang di ambil dari buku "Java How To Program - Ninth Edition (2012)"
program 1 (Time)
/**
* Write a description of class Time here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Time
{
private int hour;
private int minute;
private int second;
public void setTime(int h, int m, int s)
{
if ( ( h >= 0 && h < 24 ) && ( m >= 0 && m < 60 ) &&( s >= 0 && s < 60 ) )
{
hour = h;
minute = m;
second = s;
}
else
throw new IllegalArgumentException("hour, minute and/or second was out of range" );
}
public String toUniversalString()
{
return String.format( "%02d:%02d:%02d", hour, minute, second );
}
public String toString()
{
return String.format( "%d:%02d:%02d %s",
( ( hour == 0 || hour == 12 ) ? 12 : hour % 12 ),
minute, second, ( hour < 12 ? "AM" : "PM" ) );
}
}
Program 2 (TimeTest)
/**
* Write a description of class TimeTest here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class TimeTest
{
public static void main( String [] args )
{
Time time = new Time();
System.out.print (" The initial universal time is: ");
System.out.println ( time.toUniversalString() );
System.out.print (" The initial Standard time is: ");
System.out.println ( time.toString() );
System.out.println ();
time.setTime(13, 27, 6);
System.out.print (" Universal time after selfTime: ");
System.out.println ( time.toUniversalString() );
System.out.print (" Standard time after selfTime is: ");
System.out.println ( time.toString() );
System.out.println();
try
{
time.setTime(99, 99, 99);
}
catch (IllegalArgumentException e)
{
System.out.println (" After attempting invalid settings: ");
System.out.print (" Universal time : ");
System.out.println ( time.toUniversalString() );
System.out.print (" Standard time: ");
System.out.println (time.toString() );
}
}
}
Program 3 (MemberAccesTest)
/**
* Write a description of class MemberAccessTest here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class MemberAccessTest
{
public static void main( String[] args )
{
Time time = new Time();
time.hour = 7; // error: hour has private access in Time1
time.minute = 15; // error: minute has private access in Time1
time.second = 30; // error: second has private access in Time1
}
}
Program 4 (ThisTest)
/**
* Write a description of class ThisTest here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class ThisTest
{
public static void main( String[] args )
{
SimpleTime time = new SimpleTime( 15, 30, 19 );
System.out.println( time.buildString() );
}
}
class SimpleTime
{
private int hour;
private int minute;
private int second;
public SimpleTime( int hour, int minute, int second )
{
this.hour = hour;
this.minute = minute;
this.second = second;
}
public String buildString()
{
return String.format( "%24s: %s\n%24s: %s","this.toUniversalString()", this.toUniversalString(),
"toUniversalString()", toUniversalString());
}
public String toUniversalString()
{
return String.format( "%02d:%02d:%02d",this.hour, this.minute, this.second);
}
}
Program 5 (Time2)
/**
* Write a description of class Time2 here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Time2
{
private int hour;
private int minute;
private int second;
public Time2()
{
this( 0, 0, 0 );
}
public Time2( int h )
{
this( h, 0, 0 );
}
public Time2( int h, int m )
{
this( h, m, 0 );
}
public Time2( int h, int m, int s )
{
setTime( h, m, s );
}
public Time2( Time2 time )
{
this( time.getHour(), time.getMinute(), time.getSecond() );
}
public void setTime( int h, int m, int s )
{
setHour( h );
setMinute( m );
setSecond( s );
}
public void setHour( int h )
{
if ( h >= 0 && h < 24 )
hour = h;
else
throw new IllegalArgumentException( "hour must be 0-23" );
}
// validate and set minute
public void setMinute( int m )
{
if ( m >= 0 && m < 60 )
minute = m;
else
throw new IllegalArgumentException( "minute must be 0-59" );
}
public void setSecond( int s )
{
if ( s >= 0 && s < 60 )
second = ( ( s >= 0 && s < 60 ) ? s : 0 );
else
throw new IllegalArgumentException( "second must be 0-59" );
}
public int getHour()
{
return hour;
}
public int getMinute()
{
return minute;
}
public int getSecond()
{
return second;
}
public String toUniversalString()
{
return String.format("%02d:%02d:%02d", getHour(), getMinute(), getSecond() );
}
public String toString()
{
return String.format( "%d:%02d:%02d %s",
( (getHour() == 0 || getHour() == 12) ? 12 : getHour() % 12 ),
getMinute(), getSecond(), ( getHour() < 12 ? "AM" : "PM" ) );
}
}
Program 6 (Time2Test)
/**
* Write a description of class Time2Test here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Time2Test
{
public static void main( String[] args )
{
Time2 t1 = new Time2();
Time2 t2 = new Time2( 2 );
Time2 t3 = new Time2( 21, 34 );
Time2 t4 = new Time2( 12, 25, 42 );
Time2 t5 = new Time2( t4 );
System.out.println( "Constructed with:" );
System.out.println( "t1: all arguments defaulted" );
System.out.printf( " %s\n", t1.toUniversalString() );
System.out.printf( " %s\n", t1.toString() );
System.out.println("t2: hour specified; minute and second defaulted" );
System.out.printf( " %s\n", t2.toUniversalString() );
System.out.printf( " %s\n", t2.toString() );
System.out.println("t3: hour and minute specified; second defaulted" );
System.out.printf( " %s\n", t3.toUniversalString() );
System.out.printf( " %s\n", t3.toString() );
System.out.println( "t4: hour, minute and second specified" );
System.out.printf( " %s\n", t4.toUniversalString() );
System.out.printf( " %s\n", t4.toString() );
System.out.println( "t5: Time2 object t4 specified" );
System.out.printf( " %s\n", t5.toUniversalString() );
System.out.printf( " %s\n", t5.toString() );
try
{
Time2 t6 = new Time2( 27, 74, 99 );
}
catch ( IllegalArgumentException e )
{
System.out.printf( "\nException while initializing t6: %s\n",e.getMessage() );
}
}
}
untuk output, silahkan dicoba sendiri, Karena dengan mencoba kita akan sekaligus belajar.
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