顺序串

public class SqString {

	char[] data;
	int length;
	
	SqString() {
		data = new char[30];
		length = 0;
	}
	
	SqString(String s) {
		data = new char[30];
		for(int i=0; i<s.length(); i++) {
			data[i] = s.charAt(i);
	
		}
		length = s.length();
	}
	
	void strCopy(SqString s) {
		for(int i=0; i<s.length; i++) {
			data[i] = s.data[i];
		}
		length = s.length;
	}
	
	boolean strEqual(SqString s) {
		if(length != s.length)
			return false;
		for(int i=0; i<length; i++) {
			if(data[i] != s.data[i]) {
				return false;
			}
		}
		return true;
	}
	
	int strLen() {
		return length;
	}
	
	void strConcat(SqString s) {
		for(int i=0; i<s.length; i++) {
			data[i+length] = s.data[i];
		}
		length = length + s.length;
	}
	
	SqString subStr(int from, int to) {
		SqString s = new SqString();
		if(from<0 || from >=length || from+1>to || to<=0 || to>length) {
			return s;
		}
		for(int i= from ; i<to; i++) {
			s.data[i-from] = data[i];
		}
		s.length = to - from;
		return s;
	}
	
	void strInsert(int from, SqString s) {
		if(from <0 || from > length) {
			return;
		}
		for(int i=length-1 ; i>=from; i--) {
			data[i+s.length] = data[i];
		}
		for(int i=0; i<s.length; i++) {
			data[i+from] = s.data[i];
		}
		length += s.length;
	}
	
	SqString strDel(int from, int to) {
		SqString s = new SqString();
		if(from<0 || from >=length || from+1>to || to<=0 || to>length) {
			return s;
		}
		
		for(int i=from ; i<to; i++) {
			s.data[i-from] = data[i];
		}
		s.length = to - from;
		for(int i=to; i<length; i++) {
			data[i - to + from] = data[i];
		}
		length -= (to-from);
		return s;
	}
	
	void strReplace(SqString s, int from, int to) {
		strDel(from, to);
		strInsert(from, s);
	}
	
	void display() {
		for(int i=0; i<length; i++) {	
			System.out.print(data[i]);
	
		}
		System.out.println();
	}
	
	int strCmp(SqString s) {
		int len;
		if(length < s.length) 
			len = length;
		else 
			len = s.length;
		for(int i=0; i<len; i++) {
			if(data[i] < s.data[i])
				return -1;
			else if(data[i] > s.data[i])
				return 1;
		}
		if(length == s.length)
			return 0;
		else if(length < s.length) {
			return -1;
		} else {
			return 1;
		}
	}
	public static void main(String[] args) {
		SqString s = new SqString("Hello");
		s.display();
		s.strCopy(new SqString(" World!"));
		s.display();
		System.out.println(s.strEqual(new SqString(" World!")));
		System.out.println(s.strLen());
		s.strConcat(new SqString("Hello"));
		s.display();
		SqString res = s.subStr(4, 12);
		res.display();
		s.display();
		s.strInsert(2, new SqString("qq"));
		s.display();
		s.strInsert(14, new SqString("haha"));
		System.out.println(s.strLen());
		s.display();
		res = s.strDel(3, 8);
		s.display();
		res = s.strDel(9, 13);
		s.display();
		s.strReplace(new SqString("Tencent"), 2, 4);
		s.display();
		System.out.println(s.strLen());
		System.out.println(s.strCmp(new SqString(" WTencentHello")));
		System.out.println(s.strCmp(new SqString(" WTencent")));
		System.out.println(s.strCmp(new SqString(" WTencentHello4554")));
		System.out.println(s.strCmp(new SqString(" Wt")));
		
	}

}

结果：

Hello
 World!
true
7
 World!Hello
ld!Hello
 World!Hello
 Wqqorld!Hello
18
 Wqqorld!Hellohaha
 Wq!Hellohaha
 Wq!Hello
 WTencentHello
14
0
1
-1
-1

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