Almost the Same Old Stuff - Beginning J2ME: From Novice to Professional - page 41

String and StringBuffer
Both String and StringBuffer are present in the CLDC java.lang package. They are largely
unchanged from their J2SE counterparts.
The largest change in the String class in CLDC 1.0 is the elimination of valueOf() static
methods that convert between floating-point primitives and String s, although these are present in
CLDC 1.1. A few other obscure methods are absent from CLDC's String class, but you probably
won't miss them. For example, although CLDC's String includes the compareTo(String str)
method, it doesn't have either the compareTo(Object o) or compareToIgnoreCase(String str)
methods that are found in the J2SE SDK. (CLDC 1.1 does include an equalsIgnoreCase() method
in the String class.) There are simple workarounds for these limitations. You can, for example,
call the toString() method on an object and pass it to compareTo(String str) .
StringBuffer 's append() and insert() methods do not include overrides for floating-point
types in the CLDC 1.0 version of the class, but these are available in CDLC 1.1. Also, the substring()
method has been pruned. Other than that, however, StringBuffer should be very familiar for
seasoned J2SE programmers.
Math
The Math class contains static methods for performing mathematical calculations. In J2SE, many
of these methods involve trigonometric functions on floating-point numbers. In CLDC 1.0,
these are all gone, leaving only a handful of methods. CLDC 1.1, because it supports floating-
point types, includes several more methods in java.lang.Math , but CLDC's java.lang.Math is
still a subset of the J2SE version of the class. In the API listing that follows, the plus signs (+)
indicate new variables or methods in CLDC 1.1.
public final class Math
extends java.lang.Object {
// Constants
+ public static final double E;
+ public static final double PI;
// Static methods
public static int abs(int a);
public static long abs(long a);
+ public static float abs(float a);
+ public static double abs(double a);
+ public static native double ceil(double a);
+ public static native double cos(double a);
+ public static native double floor(double a);
public static int max(int a, int b);
public static long max(long a, long b);
+ public static float max(float a, float b);
+ public static double max(double a, double b);
public static int min(int a, int b);
public static long min(long a, long b);
+ public static float min(float a, float b);
+ public static double min(double a, double b);
+ public static native double sin(double a);