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How to solve: Java collection error: Collection operation exception
Introduction:
In the development process of Java, collections are often used to store and operate a group of data. However, sometimes we encounter collection operation exceptions, which may cause the program to crash or produce incorrect results. This article will introduce some common collection operation exceptions and provide corresponding solutions and code examples.
I. Types and causes of collection operation exceptions:
II. Solution:
The following is a simple sample code to demonstrate the solution to the concurrent modification exception:
List<String> list = new ArrayList<>(); list.add("A"); list.add("B"); list.add("C"); Iterator<String> iterator = list.iterator(); while(iterator.hasNext()){ String element = iterator.next(); if(element.equals("B")){ iterator.remove(); } }
The following is a simple sample code to demonstrate the solution to unsupported operation exceptions:
List<String> list = new ArrayList<>(); list.add("A"); list.add("B"); list.add("C"); if(list instanceof RandomAccess){ list.add(1, "D"); }else{ List<String> newList = new ArrayList<>(); for(int i=0; i<list.size(); i++){ if(i == 1){ newList.add("D"); } newList.add(list.get(i)); } list = newList; }
Conclusion:
In Java collection operations, avoid concurrent modification exceptions and unsupported operation exceptions are issues that must be paid attention to during the development process. By understanding the types and causes of exceptions and taking corresponding solutions, the stability and correctness of the program can be ensured. I hope the solutions provided in this article can be helpful in solving the problem of collection operation exceptions.
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