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Copy pathMyStringBuffer.java
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142 lines (99 loc) · 3.18 KB
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package studyjava;
public class MyStringBuffer implements IStringBuffer{
String s;
@Override
public void append(String str) {
System.out.println("此方法可在末尾追加字符串");
s += str;//s可根据需要提前声明。或利用Scanner输入。
System.out.println(s);
}
@Override
public void append(char c) {
System.out.println("此方法可在末尾追加字符");
s += c;//s可根据需要提前声明。或利用Scanner输入。
System.out.println(s);
}
@Override
public void insert(int pos, char b) {
//虽然StringBuffer的总空间大于内容长度，但最多可以在位置是“原数据的长度（这里为12）”插入新元素，即紧接着原数据。
//经测试，上述规则和StringBuffer的插入规则一样
String s = "I can do it!";//测试用。假设它为原字符串。
String s2 = "";
String s3= "";
char[] C = s.toCharArray();
for (int i = 0; i < pos; i++) {
s2 += C[i];
}
for (int j = pos ; j < C.length; j++) {
s3 += C[j];
}
System.out.println("在指定位置插入字符串后的新字符为: " + s2 + b + s3);
}
@Override
public void insert(int pos, String b) {
String s2 = "abcde";//测试用。假设它为原字符串
String s3 = "";
String s4 = "";
String[] S = s2.split("");
for (int i = 0; i < pos; i++) {
s3 += S[i];
}
for (int j = pos ; j < S.length ; j++) {
s4 += S[j];
}
System.out.println("在指定位置插入字符串后的新字符为: " + s3 + b + s4);
}
@Override
public void delete(int start) {
String s = "DAnte";//测试用。假设它为原字符串
String s2 = "";
String[] S = s.split("");
for (int i = 0; i < start; i++) {
s2 += S[i];
}
System.out.println(s2);
}
@Override
public void delete(int start, int end) {
String s = "Let us go!";//测试用。假设它为原字符串
String s2 = "";
String[] S = s.split("");
for (int i = start; i < end; i++) {
S[i] = null;
}
for (int i = 0; i < S.length; i++) {
if(S[i] != null) {
s2 += S[i];
}
}
System.out.println(s2);
}
@Override
public void reverse() {
String s = "Devil";//测试用。假设它为原字符串
String s2 = "";
String[] S = s.split("");
String[] S2 = s.split("");
int b = S.length - 1;
for (int i = 0; i < S.length / 2; i++) {
S[i] = S[b];
s2 += S[i];
b--;
}
for (int i = S2.length / 2 ; i < S2.length; i++) {
S[i] = S2[b];
s2 += S[i];
b--;
}
System.out.println(s2);
}
@Override
public int length() {
String s = "Rainbow";//测试用。假设它为原字符串
int Chang = 0;
for (int i = 0; i < s.length(); i++) {
Chang++;
}
return Chang;
}
}