Map<Car, Integer> map = new HashMap<Car, Integer>(); map.put(new Car("black", "benz"), 1); map.put(new Car("black", "benz"), 2); map.put(new Car("black", "BMW"), 2); map.put(new Car("red", "benz"), 2); for(Entry<Car, Integer> entry : map.entrySet()) { System.out.println(entry.getKey().getBrand()); } System.out.println("~~~~~~~~~~~~~~~"); map.forEach((Car k,Integer v) -> System.out.println(k.getBrand() + " " + v));后面的lamdba哪里錯了啊，運行就報錯
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fenkapian這個錯 Exception in thread "main" java.lang.Error: Unresolved compilation problems: k cannot be resolved to a variable Syntax error on token ",", . expected Syntax error on token "-", -- expected k cannot be resolved to a variable Syntax error on token ";", delete this token -
onemoo你用的 JDK 版本是多少？ 這個錯誤看起來是編譯器不認識這個語法，通?？赡苁悄阌玫?JDK 低于 1.8。 你安裝的 JavaSE 8 嗎？
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fenkapian就是8啊
點擊展開后面4條
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