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1 public class Solution { 2 public ArrayList> threeSum(int[] num) { 3 if(num == null) 4 return null; 5 6 Arrays.sort(num); 7 HashSet> set = new HashSet>(); 8 9 for(int i = 0; i tmp = new ArrayList();17 tmp.add(nu... 阅读全文
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摘要：
1 public class Solution { 2 public ArrayList> threeSum(int[] num) { 3 if(num == null) 4 return null; 5 6 Arrays.sort(num); 7 HashSet> set = new HashSet>(); 8 9 for(int i = 0; i tmp = new ArrayList();17 tmp.add(nu... 阅读全文
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Visitor:Represent an operation to be performed on the elements of an object structure. Visitor lets you define a new operation without changing the classes of the elements on which it operates. 阅读全文
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Memento:Without violating encapsulation, capture and externalize an object's internal state so that the object can be restored to this state later. 阅读全文
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Mediator:Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently. 阅读全文
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Interpreter:Given a language, define a representation for its grammar along with an interpreter that uses the representation to interpret sentences in the language. 阅读全文
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Prototype: Specify the kinds of objects to create using a prototypical instance, and create new objects by copying this prototype. 阅读全文
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Builder:Separate the construction of a complex object from its representation so that the same construction process can create different representations. 阅读全文
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Chain of Responsibility:Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it. 阅读全文
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Flyweight:Use sharing to support large numbers of fine-grained objects efficiently. 阅读全文
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