43 lines
1.6 KiB
Java
43 lines
1.6 KiB
Java
import java.util.ArrayList;
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import java.util.List;
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public class LoopsWrongRanges {
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public static void main(String[] args) {
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runTest(new LoopTest(-2, 2, 1, "Normal"));
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runTest(new LoopTest(-2, 2, 0, "Zero increment"));
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runTest(new LoopTest(-2, 2, -1, "Increments away from stop value"));
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runTest(new LoopTest(-2, 2, 10, "First increment is beyond stop value"));
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runTest(new LoopTest(2, -2, 1, "Start more than stop: positive increment"));
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runTest(new LoopTest(2, 2, 1, "Start equal stop: positive increment"));
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runTest(new LoopTest(2, 2, -1, "Start equal stop: negative increment"));
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runTest(new LoopTest(2, 2, 0, "Start equal stop: zero increment"));
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runTest(new LoopTest(0, 0, 0, "Start equal stop equal zero: zero increment"));
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}
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private static void runTest(LoopTest loopTest) {
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List<Integer> values = new ArrayList<>();
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for (int i = loopTest.start ; i <= loopTest.stop ; i += loopTest.increment ) {
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values.add(i);
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if ( values.size() >= 10 ) {
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break;
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}
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}
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System.out.printf("%-45s %s%s%n", loopTest.comment, values, values.size()==10 ? " (loops forever)" : "");
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}
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private static class LoopTest {
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int start;
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int stop;
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int increment;
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String comment;
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public LoopTest(int start, int stop, int increment, String comment) {
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this.start = start;
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this.stop = stop;
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this.increment = increment;
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this.comment = comment;
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}
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}
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}
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