assertTrue() 不输入内部函数参数答案

【问题标题】：assertTrue() doesn't enter inner function paramterassertTrue() 不输入内部函数参数
【发布时间】：2020-01-20 19:57:23
【问题描述】：

所以我用这些变量创建了一个 Trie 类。

Node rootNode = new Node();
int nodeCount = 1;
int wordCount = 0;
static StringBuilder indexList1 = new StringBuilder();
static StringBuilder indexList2 = new StringBuilder();

我目前正在尝试为 trie 构建一个 equals 函数，我这样做的方式是购买遍历 trie 并将索引连接到静态字符串构建器中。当这两个对象都完成后，我比较字符串。这是equals函数的代码：

public void equalsHelper(Node n1, int List) {
    if (List == 1) {
        for (int i = 0; i < 26; i++) {
            if(n1.nodes[i] != null) {
                indexList1.append(i);
                indexList1.append(n1.nodes[i].frequency);
                equalsHelper(n1.nodes[i], List);
            }
        }
    }
    else if (List == 2) {
        for (int i = 0; i < 26; i++) {
            if(n1.nodes[i] != null) {
                indexList2.append(i);
                indexList2.append(n1.nodes[i].frequency);
                equalsHelper(n1.nodes[i], List);
            }
        }
    }
}

public boolean equals(Trie trie2) {
    System.out.println("I was entered");
    if (this.nodeCount == 1 && trie2.nodeCount == 1) return true;
    if (indexList1.length() > 0) indexList1.setLength(0);
    if (indexList2.length() > 0) indexList2.setLength(0);
    if (this.wordCount != trie2.wordCount || this.nodeCount != trie2.nodeCount) return false;
    equalsHelper(this.rootNode, 1);
    equalsHelper(trie2.rootNode, 2);
    return indexList1.toString() == indexList2.toString();
}

所以问题来了，当我通过这个测试用例运行它时，它甚至似乎没有进入函数 equals

add("cares");
add("caress");
add("baboon");
studentTrie.add("car");         
studentTrie2.add("car");
assertTrue(studentTrie.equals(studentTrie2), "Equal Trie objects found unequal");

它所做的只是立即返回 false。当我尝试单步调试调试器时，它甚至似乎都没有进入 equals 调用，但是当它应该返回 true 时却以某种方式返回 false。这是它显示给我的错误。

org.opentest4j.AssertionFailedError: Equal Trie objects found unequal ==> expected: <true> but was: <false>

at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:40)
at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:42)
at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:160)
at passoff.TrieTest.testEquals(TrieTest.java:93)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:513)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:170)
at org.junit.jupiter.engine.execution.ThrowableCollector.execute(ThrowableCollector.java:40)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:166)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:113)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:58)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$3(HierarchicalTestExecutor.java:113)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.executeRecursively(HierarchicalTestExecutor.java:108)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.execute(HierarchicalTestExecutor.java:79)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$2(HierarchicalTestExecutor.java:121)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$3(HierarchicalTestExecutor.java:121)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.executeRecursively(HierarchicalTestExecutor.java:108)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.execute(HierarchicalTestExecutor.java:79)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$2(HierarchicalTestExecutor.java:121)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.lambda$executeRecursively$3(HierarchicalTestExecutor.java:121)
at org.junit.platform.engine.support.hierarchical.SingleTestExecutor.executeSafely(SingleTestExecutor.java:66)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.executeRecursively(HierarchicalTestExecutor.java:108)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor$NodeExecutor.execute(HierarchicalTestExecutor.java:79)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:55)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:43)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:170)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:154)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

我想知道关于 assertFalse/assertTrue 函数是否有一些我不知道的地方。无论如何，任何帮助将不胜感激。

【问题讨论】：

expected: <true> but was: <false> 有什么问题？
抱歉问题应该是真的
请注意，您应该重写 equals 方法，以使其按预期工作。
这是个好主意，但是当我这样做时，它会说“方法不会覆盖其超类中的方法”
它甚至似乎没有进入等于的函数确定它有。它甚至返回一个值 - false

标签： java debugging trie

【解决方案1】：

字符串应该与String#equals而不是==进行比较

return indexList1.toString() == indexList2.toString();

【讨论】：

这是一个好点！它不能解决问题，但谢谢！我这个学期刚开始学习Java。谢谢！

【解决方案2】：

所以问题是，一旦我发现函数没有进入正确的类，我意识到我从未覆盖过该函数。我发现这个页面很有帮助！ https://www.geeksforgeeks.org/overriding-equals-method-in-java/

我只需要这样做，效果很好！我非常感谢所有让我走上正轨的不同建议。

【讨论】：