StringBuffer sb = new StringBuffer(); sb.append(endDate.substring(5,7)); endDate.substring(5,7)这句是啥意思啊

StringBuffer sb = new StringBuffer(); sb.append(endDate.substring(5,7)); endDate.substring(5,7)这句是啥意思啊 StringBuffer sb = new StringBuffer( 1=1 and a.DELETED='0' ); 这句话的意思是什么意思StringBuffer sb = new StringBuffer( 1=1 and a.DELETED='0' ); 这句话的意思是设DELETED默认为0, 定义了StringBuffer数组,为什么还要创建string buffers如下程序：public class ThisHappens {public static void main(String[] args) {StringBuffer[] stringBuffers = new StringBuffer[10];for (int i = 0; i < stringBuffers.length; i ++) {strin String aa,b,c; aa=”bb”; b=”dd”+aa; c=”cc”+b+aa; StringBuffer d = new StringBuffer(c);请问总共创建了多少个对象?求具体解释. public class Foo { public static void main(String[] args) { StringBuffer a=new StringBuffer(A);问下这里的a怎么和“A‘’,b怎么和''B相等的 StringBuffer sb2=sb1;是什么意思那sb1==sb2与sb1=sb2有什么不同么? sb+sb=? return new StringBuffer().append(inputNum).reverse().toString(); 关于JAVA的题1.关于字符串,下列语句不正确的是________A.String s = new String(”Olympic game”);B.“Welcome to Guangzhou”.indexOf(‘o’); C.String s = “Great Wall”; s.delete(2,5);D.StringBuffer buffer = new StringBuffer(); b send sb sth=send sth () sb return sth.to sb.=return sb. help sb sth=help sb with `` smile to sb= sb a smile show sb around=? find sb sth = cheer sb up= somebody=sb是什么意思 NC=SB吗?