Homework 3

javali_tests/HW3_nop90/Assignments/Errors/ArrayAreNotCovariant.javali

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+// Test that arrays are not covariant
+
+class Main {
+	void main() {
+		boolean y;
+		A[] Array1;
+		B[] Array2;
+    	Array2 = new B[10];
+
+    	Array1 = Array2;
+	}
+}
+
+class B extends A {}
+
+class A {}

javali_tests/HW3_nop90/Assignments/Errors/AssignToMethodCall.javali

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+// The left-hand side of an assignment cannot be a method call
+// Valid options are variable accesses, fields or an indexed array
+
+class Main {
+	void main() {
+		action() = read();
+	}
+	int action() {
+		return 0;
+	}
+}

javali_tests/HW3_nop90/Assignments/Errors/AssignToThis.javali

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+// The left-hand side of an assignment cannot be a reference to this
+// Valid options are variable accesses, fields or an indexed array
+
+class Main {
+	void main () {
+		int b;
+		int[] c;
+		c = new int[5];
+		this.a = 10;
+		b = 10;
+		c[4] = 10;
+		this = null;
+	}
+	int a;
+}