Breaking out of nested loops (eugenp#7196)

johanjanssen · maibin · commit 9ee237c69c72 · 2019-06-26T20:33:48.000+02:00
* Added Maven profiles example.

* Added break examples.
diff --git a/core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/breakloop/LoopBreaking.java b/core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/breakloop/LoopBreaking.java
@@ -0,0 +1,47 @@
+package com.baeldung.breakloop;
+
+public class LoopBreaking {
+
+    public String simpleBreak() {
+        String result = "";
+        for (int outerCounter = 0; outerCounter < 2; outerCounter++) {
+            result += "outer" + outerCounter;
+            for (int innerCounter = 0; innerCounter < 2; innerCounter++) {
+                result += "inner" + innerCounter;
+                if (innerCounter == 0) {
+                    break;
+                }
+            }
+        }
+        return result;
+    }
+
+    public String labelBreak() {
+        String result = "";
+        myBreakLabel:
+        for (int outerCounter = 0; outerCounter < 2; outerCounter++) {
+            result += "outer" + outerCounter;
+            for (int innerCounter = 0; innerCounter < 2; innerCounter++) {
+                result += "inner" + innerCounter;
+                if (innerCounter == 0) {
+                    break myBreakLabel;
+                }
+            }
+        }
+        return result;
+    }
+
+    public String usingReturn() {
+        String result = "";
+        for (int outerCounter = 0; outerCounter < 2; outerCounter++) {
+            result += "outer" + outerCounter;
+            for (int innerCounter = 0; innerCounter < 2; innerCounter++) {
+                result += "inner" + innerCounter;
+                if (innerCounter == 0) {
+                    return result;
+                }
+            }
+        }
+        return "failed";
+    }
+}
diff --git a/core-java-modules/core-java-lang-syntax/src/test/java/com/baeldung/breakloop/LoopBreakingUnitTest.java b/core-java-modules/core-java-lang-syntax/src/test/java/com/baeldung/breakloop/LoopBreakingUnitTest.java
@@ -0,0 +1,25 @@
+package com.baeldung.breakloop;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class LoopBreakingUnitTest {
+
+    private LoopBreaking loopBreaking = new LoopBreaking();
+
+    @Test
+    void whenUsingBreak_shouldBreakInnerLoop() {
+        assertEquals("outer0inner0outer1inner0", loopBreaking.simpleBreak());
+    }
+
+    @Test
+    void whenUsingLabeledBreak_shouldBreakInnerLoopAndOuterLoop() {
+        assertEquals("outer0inner0", loopBreaking.labelBreak());
+    }
+
+    @Test
+    void whenUsingReturn_shouldBreakInnerLoopAndOuterLoop() {
+        assertEquals("outer0inner0", loopBreaking.usingReturn());
+    }
+}
