Java API 汇总（未完待续）

-java.lang.Math static int Math.abs(int); the absolute value static long Math.abs(long); the absolute value static float Math.abs(float); the absolute value static double Math.abs(double); the absolute value static double Math.cos(double); the cosine value, the argument is a radian value static double Math.sin(double); the sine value, the argument is a radian value static double Math.tan(double); the tangent value, the argment is a radian value static double Math.log(double); the natural logarithm value static double Math.exp(double); the exponential value static double Math.log10(double); the base 10 logarithm value static double Math.pow(double); the power value static int Math.min(int, int); the minimum value static long Math.min(long, long); the minimum value static float Math.min(float, float); the minimum value static double Math.min(double, double); the minimum value static int Math.max(int, int); the maximum value static long Math.max(long, long); the maximum value static float Math.max(float, float); the maximum value static double Math.max(double, double); the maximum value static double Math.random(); a random double value between 0 and 1 static long Math.round(double); the round value of a double value static int Math.round(float); the round value of a double value static double Math.sqrt(double); the square value ------------------------------------------------------------------------------------------- -java.lang.Byte constructor Byte Byte(byte); byte byteValue(); the byte value int intValue(); the int value long longValue(); the long value float floatValue(); the float value double doubleValue(); the double value static byte Byte.parseByte(String); the byte value of the String byte valueOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.lang.Integer Integer Integer(int); byte byteValue(); the byte value int intValue(); the int value long longValue(); the long value float floatValue(); the float value double doubleValue(); the double value static int Integer.parseInt(String); the int value of the String int valueOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.lang.Long constructor Long Long(long); byte byteValue(); the byte value int intValue(); the int value long longValue(); the long value float floatValue(); the float value double doubleValue(); the double value static long Long.parseLong(String); long valueOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.lang.Float constructor Float Float(float); byte byteValue(); the byte value int intValue(); the int value long longValue(); the long value float floatValue(); the float value double doubleValue(); the double value static float Float.parseFloat(String); float valueOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.lang.Double constructor Double Double(double); byte byteValue(); the byte value int intValue(); the int value long longValue(); the long value float floatValue(); the float value double doubleValue(); the double value static double Double.parseDouble(String); double valueOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.lang.Short constructor Short Short(short); short shortValue(); static short Short.parseShort(String); short valueOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.lang.Boolean constructor Boolean Boolean(boolean); boolean booleanValue(); static boolean Boolean.parseBoolean(String); boolean valueOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.lang.Character constructor Character Character(char); char charOf(String); String toString(); ------------------------------------------------------------------------------------------- -java.math.BigDecimal constructor BigDecimal BigDecimal(int); constructor BigDecimal BigDecimal(long); constructor BigDecimal BigDecimal(float); constructor BigDecimal BigDecimal(double); constructor BigDecimal BigDecimal(String); int intValue(); long longValue(); float floatValue(); double doubleValue(); String toString(); BigDecimal add(BigDecimal); BigDecimal subtract(BigDecimal); BigDecimal multiply(BigDecimal); BigDecimal divide(BigDecimal); ------------------------------------------------------------------------------------------- -java.text.NumberForamt static String NumberFormat.format(int); static String NumberFormat.format(long); static String NumberFormat.format(float); static String NumberFormat.format(double); static String NumberFormat.format(long); static NumberFormat NumberFormat.getCurrencyInstance(); static NumberFormat NumberFormat.getCurrencyInstance(java.util.Locale); static NumberFormat NumberFormat.getPercentInstance(); static NumberFormat NumberFormat.getPercentInstance(java.util.Locale); static NumberFormat NumberFormat.getNumberInstance(); static NumberFormat NumberFormat.getNumberInstance(java.util.Locale); static void NumberFormat.setMinimumFractionDigits(int); static void NumberFormat.setMaximumFractionDigits(int); ------------------------------------------------------------------------------------------- -java.text.DecimalFormat extends NumberFormat How to use "000,000"? How to use "#"? ------------------------------------------------------------------------------------------- -java.util.Locale static Locale CANADA static Locale CHINA static Locale FRANCE static Locale GERMANY static Locale ITALY static Locale JAPAN static Locale KOREA static Locale PRC static Locale TAIWAN static Locale UK static Locale US--------------------------------------------------------------------------------------------java.util.Scannerconstructor Scanner(InputStream)boolean hasNext()String next()static Integer parseInt(String)static Long parseLong(String)static Double parseDouble(String)