65 lines
2.1 KiB
Java
Executable File
65 lines
2.1 KiB
Java
Executable File
class ArrayTest {
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public static void main(String[] args) {
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CS2030STest i = new CS2030STest();
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Array<Integer> a = new Array<Integer>(4);
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i.expect("initializing an empty array",
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a.toString(), "[ 0:null, 1:null, 2:null, 3:null ]");
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a.set(0, 3);
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i.expect("set element 0 to 3",
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a.toString(), "[ 0:3, 1:null, 2:null, 3:null ]");
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a.set(1, 4);
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i.expect("set element 1 to 4",
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a.toString(), "[ 0:3, 1:4, 2:null, 3:null ]");
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a.set(2, 1);
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i.expect("set element 2 to 1",
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a.toString(), "[ 0:3, 1:4, 2:1, 3:null ]");
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a.set(3, 6);
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i.expect("set element 3 to 6",
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a.toString(), "[ 0:3, 1:4, 2:1, 3:6 ]");
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i.expect("get element 0",
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a.get(0), 3);
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i.expect("get element 1",
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a.get(1), 4);
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i.expect("get element 2",
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a.get(2), 1);
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i.expect("get element 3",
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a.get(3), 6);
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i.expect("smallest element is 1",
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a.min(), 1);
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i.expect("a.min() does not change the array",
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a.toString(), "[ 0:3, 1:4, 2:1, 3:6 ]");
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a.set(2, 9);
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i.expect("update element 2 to 9",
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a.toString(), "[ 0:3, 1:4, 2:9, 3:6 ]");
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i.expect("smallest element is now 3",
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a.min(), 3);
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i.expectCompile("cannot put a non-integer into an array of integer",
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"new Array<Integer>(4).set(0, false)", false);
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i.expectCompile("cannot get a non-integer from an array of integer",
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"String s = new Array<Integer>(4).get(0)", false);
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i.expectCompile("cannot create an array of non-comparable element",
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"class A {} Array<A> a;", false);
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i.expectCompile("cannot create an array of comparable element (but not to itself)",
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"class A implements Comparable<Long> {" +
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" public int compareTo(Long i) {" +
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" return 0; " +
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" }" +
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"}" +
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"Array<A> a;", false);
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i.expectCompile("can create an array of comparable element (to itself)",
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"class A implements Comparable<A> {" +
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" public int compareTo(A i) {" +
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" return 0; " +
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" }" +
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"}" +
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"Array<A> a;", true);
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}
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}
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