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Fixing Java puzzlers

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This commit is contained in:
Andrey Breslav
2011-11-11 20:57:53 +03:00
parent 66c1f56892
commit 30d90371dc
38 changed files with 1584 additions and 0 deletions
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docs/exPuzzlers/.idea/.name
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exPuzzlers
docs/exPuzzlers/.idea/ant.xml
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docs/exPuzzlers/.idea/vcs.xml
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docs/exPuzzlers/exPuzzlers.iml
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<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
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<content url="file://$MODULE_DIR$">
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docs/exPuzzlers/kotlin/std.kt
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namespace std
fun <T> array(vararg array : T) = array
fun array(vararg array : Byte) = array
fun array(vararg array : Char) = array
fun array(vararg array : Short) = array
fun array(vararg array : Int) = array
fun array(vararg array : Long) = array
fun array(vararg array : Double) = array
fun array(vararg array : Float) = array
fun Any?.identityEquals(other : Any?) = this === other
namespace io {
import java.io.*
fun print(message : Any?) { System.out?.print(message) }
fun print(message : Int) { System.out?.print(message) }
fun print(message : Long) { System.out?.print(message) }
fun print(message : Byte) { System.out?.print(message) }
fun print(message : Short) { System.out?.print(message) }
fun print(message : Char) { System.out?.print(message) }
fun print(message : Boolean) { System.out?.print(message) }
fun print(message : Float) { System.out?.print(message) }
fun print(message : Double) { System.out?.print(message) }
fun print(message : CharArray) { System.out?.print(message) }
fun println(message : Any?) { System.out?.println(message) }
fun println(message : Int) { System.out?.println(message) }
fun println(message : Long) { System.out?.println(message) }
fun println(message : Byte) { System.out?.println(message) }
fun println(message : Short) { System.out?.println(message) }
fun println(message : Char) { System.out?.println(message) }
fun println(message : Boolean) { System.out?.println(message) }
fun println(message : Float) { System.out?.println(message) }
fun println(message : Double) { System.out?.println(message) }
fun println(message : CharArray) { System.out?.println(message) }
private var systemIn : InputStream? = null // Unfortunately, System.in may change
private var stdin : BufferedReader? = null // This may introduce leaks of system.in objects...
fun readLine() : String? {
if (stdin == null || systemIn != System.`in`) {
stdin = java.io.BufferedReader(java.io.InputStreamReader(System.`in`))
systemIn = System.`in`
}
return stdin?.readLine()
}
}
docs/exPuzzlers/src/_02_expressive/_01_Oddity/Oddity.java
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package _02_expressive._01_Oddity;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 5). Pearson Education (USA). Kindle Edition.
*/
public class Oddity {
public static boolean isOdd(int i) {
return i % 2 == 1;
}
public static void main(String[] args) {
System.out.println(isOdd(-1));
}
}
docs/exPuzzlers/src/_02_expressive/_02_Time_for_a_Change/BigDecimalSolution.kt
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namespace change
import java.math.BigDecimal
import std.io.*
fun main(args : Array<String>) {
// Easy to make BigDecimals user-friendly
println(
"2.00".bd - "1.00"
)
}
val String.bd = BigDecimal(this)
fun BigDecimal.minus(other : BigDecimal) = this.subtract(other)
fun BigDecimal.minus(other : String) = subtract(other.bd) // this can be omitted
docs/exPuzzlers/src/_02_expressive/_02_Time_for_a_Change/Change.java
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package _02_expressive._02_Time_for_a_Change;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 7). Pearson Education (USA). Kindle Edition.
*/
public class Change {
public static void main(String args[ ] ) {
System.out.println(2.00 - 1.10);
}
}
docs/exPuzzlers/src/_02_expressive/_02_Time_for_a_Change/ChangeSolutions.java
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package _02_expressive._02_Time_for_a_Change;
import java.math.BigDecimal;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 7). Pearson Education (USA). Kindle Edition.
*/
public class ChangeSolutions {
public static void main(String args[ ] ) {
// Poor solution - still uses binary floating-point!
System.out.printf("%.2f%n", 2.00 - 1.10);
// Calculation in cents
System.out.println((200 - 110) + " cents");
// BigDecimal
System.out.println(new BigDecimal("2.00"). subtract(new BigDecimal("1.10")));
}
}
docs/exPuzzlers/src/_02_expressive/_03_Long_Division/LongDivision.java
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package _02_expressive._03_Long_Division;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 9). Pearson Education (USA). Kindle Edition.
*/
public class LongDivision {
public static void main(String[] args) {
final long MICROS_PER_DAY = 24 * 60 * 60 * 1000 * 1000;
final long MILLIS_PER_DAY = 24 * 60 * 60 * 1000;
System.out.println(MICROS_PER_DAY / MILLIS_PER_DAY);
}
}
docs/exPuzzlers/src/_02_expressive/_03_Long_Division/LongDivision.kt
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namespace long.division
import std.io.*
fun main(args : Array<String>) {
// Problematic case does not compile
// val MICROS_PER_DAY_ : Long = 24 * 60 * 60 * 1000 * 1000;
// val MILLIS_PER_DAY_ : Long = 24 * 60 * 60 * 1000
// Solution:
val MICROS_PER_DAY : Long = 24.lng * 60 * 60 * 1000 * 1000;
val MILLIS_PER_DAY : Long = 24.lng * 60 * 60 * 1000
println(MICROS_PER_DAY / MILLIS_PER_DAY)
}
docs/exPuzzlers/src/_02_expressive/_03_Long_Division/LongDivisionSolution.java
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package _02_expressive._03_Long_Division;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 9). Pearson Education (USA). Kindle Edition.
*/
public class LongDivisionSolution {
public static void main(String[] args) {
final long MICROS_PER_DAY = 24L * 60 * 60 * 1000 * 1000;
final long MILLIS_PER_DAY = 24L * 60 * 60 * 1000;
System.out.println(MICROS_PER_DAY / MILLIS_PER_DAY);
}
}
docs/exPuzzlers/src/_02_expressive/_03_Long_Division/LongDivisionSolution.kt
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namespace long.division.solution
import std.io.*
fun main(args : Array<String>) {
val MICROS_PER_DAY : Long = 24.lng * 60 * 60 * 1000 * 1000;
val MILLIS_PER_DAY : Long = 24.lng * 60 * 60 * 1000
println(MICROS_PER_DAY / MILLIS_PER_DAY)
}
docs/exPuzzlers/src/_02_expressive/_04_Elementary/Elementary.java
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package _02_expressive._04_Elementary;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 11). Pearson Education (USA). Kindle Edition.
*/
public class Elementary {
public static void main(String[] args) {
System.out.println(12345 + 5432l);
}
}
docs/exPuzzlers/src/_02_expressive/_04_Elementary/Elementary.kt
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namespace elementary
import std.io.*
fun main(args : Array<String>) {
// Problematic case does not compile
// println(12345 + 5432l)
// Correct syntax:
println(12345 + 5432.lng)
}
docs/exPuzzlers/src/_02_expressive/_04_Elementary/ElementarySolution.java
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package _02_expressive._04_Elementary;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 11). Pearson Education (USA). Kindle Edition.
*/
public class ElementarySolution {
public static void main(String[] args) {
System.out.println(12345 + 5432L);
}
}
docs/exPuzzlers/src/_02_expressive/_05_The_Joy_of_Hex/JoyOfHex.java
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package _02_expressive._05_The_Joy_of_Hex;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 13). Pearson Education (USA). Kindle Edition.
*/
public class JoyOfHex {
public static void main(String[] args) {
System.out.println(Long.toHexString(0x100000000L + 0xcafebabe));
}
}
docs/exPuzzlers/src/_02_expressive/_06_Multicast/Multicast.kt
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namespace multicast
import std.io.*
fun main(args : Array<String>) {
println(-1.byt.chr.int)
println((-1).byt.chr.int)
}
docs/exPuzzlers/src/_02_expressive/_06_Multicast/Mutlicast.java
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package _02_expressive._06_Multicast;
/**
* @author abreslav
*/
public class Mutlicast {
public static void main(String[] args) {
System.out.println((int) (char) (byte) -1);
}
}
docs/exPuzzlers/src/_02_expressive/_07_Swap_Meat/CleverSwap.java
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package _02_expressive._07_Swap_Meat;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 17). Pearson Education (USA). Kindle Edition.
*/
public class CleverSwap {
public static void main(String[] args) {
int x = 1984; // (0x7c0)
int y = 2001; // (0x7d1)
x ^= y ^= x ^= y;
System.out.println("x = " + x + "; y = " + y);
// Solution: swap with a temp variable
// Do not assign to the same variable more than once in a single expression.
}
}
docs/exPuzzlers/src/_02_expressive/_07_Swap_Meat/CleverSwap.kt
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namespace cleverswap
import std.io.*
fun main(args : Array<String>) {
var x = 1
// Do not assign to the same variable more than once in a single expression.
// Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 19). Pearson Education (USA). Kindle Edition.
// x += (y += z)
}
docs/exPuzzlers/src/_02_expressive/_08_Dos_Equis/DosEquis.java
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package _02_expressive._08_Dos_Equis;
/**
* @author abreslav
*/
public class DosEquis {
public static void main(String[] args) {
char x = 'X';
int i = 0;
System.out.print(true ? x : 0);
System.out.print(false ? i : x);
}
}
docs/exPuzzlers/src/_02_expressive/_08_Dos_Equis/DosEquis.kt
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namespace dos.equis
import std.io.*
fun main(args : Array<String>) {
// Problematic case does not compile
val x = 'X'
val i = 0
print(if (true) x else 0)
print(if (false) 0 else x)
// Mixed computations do not compile:
// val int : Int = if (true) x else 0
// val char : Char = if (false) 0 else x
}
docs/exPuzzlers/src/_02_expressive/_09_Tweedledum/Tweedledum.java
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package _02_expressive._09_Tweedledum;
/**
* @author abreslav
*/
public class Tweedledum {
public static void main(String[] args) {
byte x = 1;
byte i = 1;
x += i;
// x = x + i;
}
}
docs/exPuzzlers/src/_02_expressive/_10_Tweedledee/Tweedledee.java
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package _02_expressive._10_Tweedledee;
/**
* @author abreslav
*/
public class Tweedledee {
public static void main(String[] args) {
Object x = 1;
String i = "1";
// x += i;
x = x + i;
}
}
docs/exPuzzlers/src/_03_character/_11_The_Last_Laugh/LastLaugh.java
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package _03_character._11_The_Last_Laugh;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 25). Pearson Education (USA). Kindle Edition.
*/
public class LastLaugh {
public static void main(String args[]) {
System.out.print("H" + "a");
System.out.print('H' + 'a');
}
}
docs/exPuzzlers/src/_03_character/_11_The_Last_Laugh/LastLaugh.kt
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namespace last.laugh
import std.io.*
fun main(args : Array<String>) {
print("H" + "a")
// Problematic case does not compile
// System.out?.print('H' + 'a')
// Solution
print('H'.toString() + 'a')
}
docs/exPuzzlers/src/_03_character/_12_ABC/Abc.java
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package _03_character._12_ABC;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 27). Pearson Education (USA). Kindle Edition.
*/
public class Abc {
public static void main(String[] args) {
String letters = "ABC";
char[] numbers = {'1', '2', '3'};
System.out.println(letters + " easy as " + numbers);
// Solution:
System.out.println(letters + " easy as ");
System.out.println(numbers);
// or
System.out.println(letters + " easy as " + String.valueOf(numbers));
}
}
docs/exPuzzlers/src/_03_character/_13_Animal_Farm/AnimalFarm.java
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package _03_character._13_Animal_Farm;
/**
* Bloch, Joshua; Gafter, Neal (2005-06-24). Java™ Puzzlers: Traps, Pitfalls, and Corner Cases (p. 29). Pearson Education (USA). Kindle Edition.
*/
public class AnimalFarm {
public static void main(String[] args) {
final String pig = "length: 10";
final String dog = "length: " + pig.length();
System.out.println("Animals are equal: " + pig == dog);
// Solution:
System.out.println("Animals are equal: " + pig.equals(dog));
// or
System.out.println("Animals are equal: " + (pig.intern() == dog.intern()));
}
}
docs/exPuzzlers/src/_03_character/_13_Animal_Farm/AnimalFarm.kt
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namespace animal.farm
import std.io.*
import std.*
fun main(args : Array<String>) {
val pig = "length: 10";
val dog = "length: " + pig.length;
println("Animals are equal: " + pig == dog);
// Solution:
println("Animals are equal: " + (pig == dog));
// Note:
println("Animals are equal: " + (pig identityEquals dog));
}