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

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

@@ -0,0 +1,28 @@
+import java.util.*;
+
+class C {
+  void unmodifiableList(List<String> list) {
+    List<String> u1 = <weak_warning descr="Multiple occurrences of 'Collections.unmodifiableList(list)'">Collections.unmodifiableList(list)</weak_warning>;
+    List<String> u2 = <weak_warning descr="Multiple occurrences of 'Collections.unmodifiableList(list)'">Collections.unmodifiableList(list)</weak_warning>;
+  }
+
+  void unmodifiableMap(Map<String, Integer> map) {
+    Map<String, Integer> u1 = <weak_warning descr="Multiple occurrences of 'Collections.unmodifiableMap(map)'">Collections.unmodifiableMap(map)</weak_warning>;
+    Map<String, Integer> u2 = <weak_warning descr="Multiple occurrences of 'Collections.unmodifiableMap(map)'">Collections.unmodifiableMap(map)</weak_warning>;
+  }
+
+  void min(List<String> list) {
+    String s1 = <weak_warning descr="Multiple occurrences of 'Collections.min(list)'">Collections.min(list)</weak_warning>;
+    String s2 = <weak_warning descr="Multiple occurrences of 'Collections.min(list)'">Collections.min(list)</weak_warning>;
+  }
+
+  void max(List<String> list) {
+    String s1 = <weak_warning descr="Multiple occurrences of 'Collections.max(list)'">Collections.max(list)</weak_warning>;
+    String s2 = <weak_warning descr="Multiple occurrences of 'Collections.max(list)'">Collections.max(list)</weak_warning>;
+  }
+
+  void synchronizedList(List<String> list) {
+    List<String> s1 = Collections.synchronizedList(list);
+    List<String> s2 = Collections.synchronizedList(list);
+  }
+}

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

@@ -0,0 +1,26 @@
+class A {
+  static final int a = 0;
+
+  static class B {
+    static final int b = 1;
+
+    static class C {
+      static final int c = 2;
+    }
+  }
+
+  void test1() {
+    int i = A.a;
+    int j = A.a;
+  }
+
+  void test2() {
+    int i = A.B.b;
+    int j = A.B.b;
+  }
+
+  void test3() {
+    int i = A.B.C.c;
+    int j = A.B.C.c;
+  }
+}

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

@@ -0,0 +1,15 @@
+class A {
+  int k;
+
+  void testThis() {
+    int i = this.k;
+    int j = this.k;
+  }
+
+  static class B extends A {
+    void testSuper() {
+      int i = super.k;
+      int j = super.k;
+    }
+  }
+}