40 lines
1.2 KiB
Java
40 lines
1.2 KiB
Java
//: arrays/IceCream.java
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// Returning arrays from methods.
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import java.util.*;
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public class IceCream {
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private static Random rand = new Random(47);
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static final String[] FLAVORS = {
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"Chocolate", "Strawberry", "Vanilla Fudge Swirl",
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"Mint Chip", "Mocha Almond Fudge", "Rum Raisin",
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"Praline Cream", "Mud Pie"
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};
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public static String[] flavorSet(int n) {
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if(n > FLAVORS.length)
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throw new IllegalArgumentException("Set too big");
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String[] results = new String[n];
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boolean[] picked = new boolean[FLAVORS.length];
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for(int i = 0; i < n; i++) {
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int t;
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do
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t = rand.nextInt(FLAVORS.length);
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while(picked[t]);
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results[i] = FLAVORS[t];
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picked[t] = true;
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}
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return results;
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}
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public static void main(String[] args) {
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for(int i = 0; i < 7; i++)
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System.out.println(Arrays.toString(flavorSet(3)));
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}
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} /* Output:
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[Rum Raisin, Mint Chip, Mocha Almond Fudge]
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[Chocolate, Strawberry, Mocha Almond Fudge]
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[Strawberry, Mint Chip, Mocha Almond Fudge]
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[Rum Raisin, Vanilla Fudge Swirl, Mud Pie]
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[Vanilla Fudge Swirl, Chocolate, Mocha Almond Fudge]
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[Praline Cream, Strawberry, Mocha Almond Fudge]
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[Mocha Almond Fudge, Strawberry, Mint Chip]
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*///:~
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