Demonstration of Java assert

core-java/src/main/java/com/baeldung/assertion/Assertion.java

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+package com.baeldung.assertion;
+
+/**
+ * Simple demonstration of using Java assert keyword.
+ */
+public class Assertion {
+
+  public static void main(String[] args) {
+    Assertion assertion = new Assertion();
+    assertion.setup();
+  }
+
+  public void setup() {
+    Object conn = getConnection();
+    assert conn != null : "Connection is null";
+
+    // continue with other setup ...
+  }
+
+  // Simulate failure to get a connection; using Object
+  // to avoid dependencies on JDBC or some other heavy
+  // 3rd party library
+  public Object getConnection() {
+    return null;
+  }
+}