public StringBuilder append(Object obj) { return append(String.valueOf(obj)); } @Override public StringBuilder append(String str) { super.append(str); return this; } public StringBuilder append(StringBuffer sb) { super.append(sb); return this; } @Override public StringBuilder append(CharSequence...
append 追加 delete 删除 insert 插入 reverse 反转 package character; public class TestString { public static void main(String[] args) { String str1 = "let there "; StringBuffer sb = new StringBuffer(str1); //根据str1创建一个StringBuffer对象 sb.append("be light"); //在最后追加 System.o...
public StringBuilder append(char[] str, int offset, int len) Appends the string representation of a subarray of the char array argument to this sequence. Characters of the char array str, starting at index offset, are appended, in order, to the contents of this sequence. The length of th...
成员方法: stringBuilder.append()将任意数据添加到StringBuilder容器中 stringBuilder.toString()将当前StringBuilder容器转换成字符串
Java中String、StringBuffer、StringBuilder的区别以及使用场景总结-CJavaPy 2)StringBuffer常用方法 使用示例: publicclassMain {publicstaticvoidmain(String[] args) { StringBuffer buffer =new StringBuffer("Hello");// 尾部添加 buffer.append(" World"); ...
AndroidRuntime: java.lang.ArrayIndexOutOfBoundsException: dstBegin > dst.length. dstBegin=294965, dst.length=294910 AndroidRuntime: at java.lang.String.getChars(String.java:802) AndroidRuntime: at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:452) ...
publicAbstractStringBuilderappend(Stringstr){if(str==null)returnappendNull();intlen=str.length();ensureCapacityInternal(count+len);str.getChars(0,len,value,count);count+=len;returnthis;}publicvoidgetChars(intsrcBegin,intsrcEnd,chardst[],intdstBegin){if(srcBegin<0){thrownewStringIndexOutOfBoundsExc...
java.long.StringBuilder类:字符串缓冲区,可以提高字符串的效率。构造方法:StringBuilder()构造一个不带任何字符串的字符生成器,其初始容量为16个字符。 代码如下: public class Demo01StringBuilder {public static void main(String[] args) { //空参数构造方法 StringBuilder bu1=new StringBuilder(); System.out....
实际上,从JDK5开始,Java编译器就做了优化,使用“+”拼接字符串,编译器编译后实际就自动优化为使用StringBuilder。 新建测试类StringTest,分别创建使用“+”拼接字符串和使用StringBuilder拼接字符串的方法;并新增Junit测试用例,分别调用拼接字符串100000次(这里不是循环拼接,而是执行多次拼接,因为一次拼接耗时太少,看不出...
public Java.Lang.IAppendable Append (string s, int start, int end); Parameters s String start Int32 end Int32 Returns IAppendable Remarks Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in...