How can I list all uppercase/lowercase permutations for any letter specified in a character array? So, say I have an array of characters like so: ['h','e','l','l','o'] and I wanted print out possible combinations for say the letter 'l' so it would print out [hello,heLlo,heLLo,helLo]. How can I list all uppercase/lowercase permutat
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JAVA中字符数组中的特定元素排列？
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