Java: Improve the inspection "Multiple occurrences of the same expression" (IDEA-207247)

java/java-tests/testData/inspection/duplicateExpressions/Lambda.java

@@ -0,0 +1,20 @@
+class C {
+  void test() {
+    accept(n -> n * n);
+    accept(n -> n * n);
+
+    accept(n -> {
+      int a = <weak_warning descr="Multiple occurrences of 'n * n'">n * n</weak_warning>;
+      int b = <weak_warning descr="Multiple occurrences of 'n * n'">n * n</weak_warning>;
+      return a + b;
+    });
+  }
+
+  void accept(I i) {
+    i.f(0);
+  }
+
+  interface I {
+    int f(int n);
+  }
+}

java/java-tests/testData/inspection/duplicateExpressions/MathMax.java

@@ -0,0 +1,6 @@
+class C {
+  void test(int i, int j) {
+    int a = <weak_warning descr="Multiple occurrences of 'Math.max(i, j)'">Math.max(i, j)</weak_warning>;
+    int b = <weak_warning descr="Multiple occurrences of 'Math.max(i, j)'">Math.max(i, j)</weak_warning>;
+  }
+}

java/java-tests/testData/inspection/duplicateExpressions/MathRandom.java

@@ -0,0 +1,6 @@
+class C {
+  void test() {
+    double x = Math.random();
+    double y = Math.random();
+  }
+}

java/java-tests/testData/inspection/duplicateExpressions/MathSin.java

@@ -0,0 +1,6 @@
+class C {
+  void test() {
+    double x = <weak_warning descr="Multiple occurrences of 'Math.sin(4)'">Math.sin(4)</weak_warning>;
+    double y = <weak_warning descr="Multiple occurrences of 'Math.sin(4)'">Math.sin(4)</weak_warning>;
+  }
+}

java/java-tests/testData/inspection/duplicateExpressions/Variable.java

@@ -0,0 +1,18 @@
+class C {
+  final int field;
+
+  C(int i) {
+    field = i;
+  }
+
+  void test(int param) {
+    int a = field;
+    int b = field;
+
+    int c = param;
+    int d = param;
+
+    int e = <weak_warning descr="Multiple occurrences of 'field + param'">field + param</weak_warning>;
+    int f = <weak_warning descr="Multiple occurrences of 'field + param'">field + param</weak_warning>;
+  }
+}