数组转为list集合 以及 java字符串的字符交换位置

数组转为list集合：

 

String[] array= {"张三","李四","王五"};
        List<String> asList = Arrays.asList(array);
        ArrayList arrayList = new ArrayList(asList);
        arrayList.add("赵六");
        System.out.println(arrayList.toString());   

 

 

String str = "Reverse a String in Java";

StringBuilder sb = new StringBuilder(str).reverse();

System.out.println(sb.toString());
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输出结果：

avaJ ni gnirtS a esreveR