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java中的“范围”是什么(（2个答案）
昨天关门了。
我想在for循环中创建一个公共字符串变量，我甚至可以在它之外使用它。我知道这在c#中是可能的，只要将字符串标记为公共字符串，bt在java中做同样的事情似乎并没有达到目的。有什么建议吗？

for (int i = 0; i < answerList.size(); i++) {
    System.out.println(answerList.get(i).q);
    answerList.get(i).spot = i;
    System.out.println(answerList.get(i).spot);
    switch (answerList.get(i).spot) {
        case 0:
            if(answerList.get(i).correct = true) {
                String correctAns = "a";
                String correctAnsVariantTwo = "A";
                break;
            }
        case 1:
            if(answerList.get(i).correct = true) {
                String correctAns = "b";
                String correctAnsVariantTwo = "B";
                break;
            }
        case 2:
            if(answerList.get(i).correct = true) {
                String correctAns = "c";
                String correctAnsVariantTwo = "C";
                break;
            }
        case 3:
            if(answerList.get(i).correct = true) {
                String correctAns = "d";
                String correctAnsVariantTwo = "D";
                break;
            }
    }
}
Scanner a = new Scanner(System.in);
String ats = a.nextLine();
if(ats.equals(correctAns)) {
    //do something
}