removeAll 疑问
// Course[] cr3 = {new Course("3","离散数学"),new Course("4","JAVA语言")}; Course[] cr3 = {(Course) coursesToSelect.get(3),(Course) coursesToSelect.get(5)}; coursesToSelect.removeAll(Arrays.asList(cr3)); 请问下用上面一行的方式删除为什么不能删除成功？？？谢谢!
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