byte a = 1;
short b = 2;
int c = 3;
long d = 4;
float e = 5.999f;
double f = 6.999d;
boolean g = true;

String dest = "" + a + b + c + d + e + f + g; 
dest += a;

// 12345.9996.999true1 と表示される
System.out.println( dest );

String strValue = "0";

byte a = Byte.parseByte(strValue);
short b = Short.parseShort(strValue);
int c = Integer.parseInt(strValue);
long d = Long.parseLong(strValue);
float e = Float.parseFloat(strValue);
double f = Double.parseDouble(strValue);

String strValue = "0";

Byte a = Byte.valueOf(strValue);
Short b = Short.valueOf(strValue);
Integer c = Integer.valueOf(strValue);
Long d = Long.valueOf(strValue);
Float e = Float.valueOf(strValue);
Double f = Double.valueOf(strValue);

String strValue = "ABC";

if ( strValue.equals( "ABC" ) ) {
	System.out.println("等しい");
}

if ( !strValue.equals( "XYZ" ) ) {
	System.out.println("等しくない");
}

import java.util.*;
import java.text.*;

public class CLCOMP { public static void main(String[] args) {

	Date myDate = null;
	String strDate = null;

	myDate = new Date();
	strDate = DateFormat.getDateInstance().format(myDate);
	System.out.println( "現在の日付 : " + strDate );

	strDate = DateFormat.getTimeInstance().format(myDate);
	System.out.println( "現在の時間 : " + strDate );

	strDate = DateFormat.getDateTimeInstance().format(myDate);
	System.out.println( "現在の日付・時間 : " + strDate );
} }

import java.util.*;
import java.text.*;

public class CLCOMP { public static void main(String[] args) {

	Calendar cal = null;
	Date myDate = null;
	String strDate = null;

	cal = Calendar.getInstance();
	cal.set( 2006, 0, 14, 18, 31 ,10 );
	myDate = cal.getTime();

	strDate = DateFormat.getDateInstance().format(myDate);
	System.out.println( "現在の日付 : " + strDate );

	strDate = DateFormat.getTimeInstance().format(myDate);
	System.out.println( "現在の時間 : " + strDate );

	strDate = DateFormat.getDateTimeInstance().format(myDate);
	System.out.println( "現在の日付・時間 : " + strDate );

} }

import java.text.*;

public class CLCOMP { public static void main(String[] args) {

	double nValue1 = 0;
	long nValue2 = 0;
	DecimalFormat decFormat = null;

	nValue1 = 123456789.125;
	decFormat = new DecimalFormat(",##0.00");
	System.out.println(decFormat.format(nValue1));

	nValue1 = 123456789.126;
	decFormat = new DecimalFormat(",##0.00");
	System.out.println(decFormat.format(nValue1));

	nValue2 = 1234567890;
	decFormat = new DecimalFormat(",##0");
	System.out.println(decFormat.format(nValue2));

} }