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@ -828,7 +828,7 @@ HTTP/1.1 的解析是基于文本的,而 HTTP/2.0 采用二进制格式。
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# 参考资料
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- 上野宣. 图解 HTTP[M]. Ren min you dian chu ban she, 2014.
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- 上野宣. 图解 HTTP[M]. 人民邮电出版社, 2014.
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- [MDN : HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP)
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- [Are http:// and www really necessary?](https://www.webdancers.com/are-http-and-www-necesary/)
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- [HTTP (HyperText Transfer Protocol)](https://www.ntu.edu.sg/home/ehchua/programming/webprogramming/HTTP_Basics.html)
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@ -12,7 +12,7 @@
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* [访问权限](#访问权限)
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* [抽象类与接口](#抽象类与接口)
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* [super](#super)
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* [重载与重写](#重载与重写)
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* [覆盖与重载](#覆盖与重载)
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* [五、String](#五string)
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* [String, StringBuffer and StringBuilder](#string,-stringbuffer-and-stringbuilder)
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* [String 不可变的原因](#string-不可变的原因)
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@ -706,11 +706,11 @@ SuperExtendExample.func()
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> [Using the Keyword super](https://docs.oracle.com/javase/tutorial/java/IandI/super.html)
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## 重载与重写
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## 覆盖与重载
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- 重写存在于继承体系中,指子类实现了一个与父类在方法声明上完全相同的一个方法;
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- 覆盖(Override)存在于继承体系中,指子类实现了一个与父类在方法声明上完全相同的一个方法;
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- 重载即存在于继承体系中,也存在于同一个类中,指一个方法与已经存在的方法或者父类的方法名称上相同,但是参数类型、个数、顺序至少有一个不同。应该注意的是,返回值不同,其它都相同不算是重载。
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- 重载(Overload)也存在于同一个类中,指一个方法与已经存在的方法名称上相同,但是参数类型、个数、顺序至少有一个不同。应该注意的是,返回值不同,其它都相同不算是重载。
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# 五、String
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@ -1986,6 +1986,7 @@ public int longestSubStringWithoutDuplication(String str) {
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int curLen = 0;
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int maxLen = 0;
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int[] indexs = new int[26];
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Arrays.fill(indexs, -1);
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for (int i = 0; i < str.length(); i++) {
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int c = str.charAt(i) - 'a';
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int preIndex = indexs[c];
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@ -2010,21 +2011,19 @@ public int longestSubStringWithoutDuplication(String str) {
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## 解题思路
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```java
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public int GetUglyNumber_Solution(int N) {
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if (N <= 6) return N;
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public int GetUglyNumber_Solution(int index) {
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if (index <= 6) return index;
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int i2 = 0, i3 = 0, i5 = 0;
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int cnt = 1;
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int[] dp = new int[N];
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int[] dp = new int[index];
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dp[0] = 1;
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while (cnt < N) {
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for (int i = 1; i < index; i++) {
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int n2 = dp[i2] * 2, n3 = dp[i3] * 3, n5 = dp[i5] * 5;
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int min = Math.min(n2, Math.min(n3, n5));
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dp[cnt++] = min;
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if (min == n2) i2++;
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if (min == n3) i3++;
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if (min == n5) i5++;
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dp[i] = Math.min(n2, Math.min(n3, n5));
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if (dp[i] == n2) i2++;
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if (dp[i] == n3) i3++;
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if (dp[i] == n5) i5++;
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}
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return dp[N - 1];
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return dp[index - 1];
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}
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```
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