回答編集履歴
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sample
test
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@@ -1 +1,113 @@
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java doc([*](https://docs.oracle.com/javase/jp/8/docs/api/java/lang/String.html#compareToIgnoreCase-java.lang.String-)) の使い方を理解していれば質問には発展しません。
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compileエラー状態のコード提示からかわったので [サンプル](https://paiza.io/projects/T4ZZARU3vjLJGxnrV35c1w?language=java)
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```java
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import java.util.*;
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public class Main {
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public static void main(String[] args) {
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ArrayList<String> foo = new ArrayList<>();
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foo.add("Abs");
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foo.add("aaaa");
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foo.add("bbbbb");
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foo.add("BBB");
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foo.add("ccccccccc");
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foo.add("CCCCCCCCC");
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foo.add("CCCCaCCCC");
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foo.add("CCCCACCCC");
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foo.add("Add");
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Collections.sort(foo, (String obj1, String obj2) ->{
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if (Objects.equals(obj1, obj2)) {
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return 0;
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} else if (Objects.isNull(obj1)) {
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return -1;
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} else if (Objects.isNull(obj2)) {
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return 1;
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}
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char[] c1 = obj1.toCharArray();
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char[] c2 = obj2.toCharArray();
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int a = 0;
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for (int i = 0; i < c1.length && 1 < c2.length; i++) {
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String s1 = ((Character) c1[i]).toString();
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String s2 = ((Character) c2[i]).toString();
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if (s1.startsWith("A") || s2.startsWith("A")) { // 対象の判定をすべて書いてください。
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a = s1.compareTo(s2);
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} else {
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a = s1.compareToIgnoreCase(s2);
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}
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if (a != 0) {
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return a;
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}
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}
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return a;
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});
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System.out.println(foo);
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}
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108
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}
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110
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111
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112
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113
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```
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