gistfile1.java

import org.junit.Test;

import static org.junit.Assert.fail;

public class StringComparisonTest {

    @Test
    public void testCompileTimeVariable() {
        String testCompileTimeString = "compileTime";
        
        if ("compileTime" == testCompileTimeString) {
            System.out.print("equal");
        } else {
            fail("unequal");
        }
    }

    @Test
    public void testLiteralValue() {
        if ("literal" == "literal") {
            System.out.print("equal");
        } else {
            fail("unequal");
        }
    }

    @Test
    public void testStatementVariable() {
        // defined as "statement" at compile time
        String resultOfConcatenation = "state" + "ment";

        if ("statement" == resultOfConcatenation) {
            System.out.print("equal");
        } else {
            fail("unequal");
        }
    }

    @Test
    public void testArrayItemVariable() {
        String[] stringArray = {"hello", "world"};

        if ("hello" == stringArray[0]) {
            System.out.print("equal");
        } else {
            fail("unequal");
        }
    }

    @Test
    public void testNewStringAtRuntime() {
        String newString = new String("newString");

        if ("newString" == newString) {
            System.out.print("equal");
        } else {
            fail("unequal");
        }
    }

    @Test
    public void testCharArrayToStringAtRuntimeVariable() {
        char[] charArray = {'h', 'e', 'l', 'l', 'o'};

        String charSequence = "";
        for (int i = 0; i < charArray.length; i++) {
            // only becomes "hello" at runtime
            charSequence += charArray[i];
        }

        if ("hello" == charSequence) {
            System.out.print("equal");
        } else {
            fail("unequal");
        }
    }
}