判断字符串是否相等？

Question

假设字符串类似这样的aba和aab就相等，现在随便给你二组字符串，请编程比较他们看是否相等？

Answer 1

    public static void main(String[] args) {
        String compStr0 = "foo";
        String compStr1 = new String("foo");
        System.out.println(compStr0.equals(compStr1));
        System.out.println(compStr0==compStr1);

        String compStr3 = "foo";
        String compStr4 = "foo";
        System.out.println(compStr3.equals(compStr4));
        System.out.println(compStr3==compStr4);

        String compStr5 = new String("foo");
        String compStr6 = new String("foo");
        System.out.println(compStr5.equals(compStr6));
        System.out.println(compStr5==compStr6);
    }

结果：
true
false
true
true
true
false