Question

求教，Java的StringBuilder里的append（）方法要怎么用？括号里面要怎么填eclipse才不出现错误

Answer 1

append方法就是将字符串追加到当前StringBuilder实例的结尾。
导入java.lang.StringBuilder类。
StringBuilder sb=new StringBuilder("abc");
sb.append("123");
System.out.println(sb);//输出abc123

Answer 2

append可以填许多种型,
StringBuilder append(double d)
StringBuilder append(float f)
StringBuilder append(int i)
StringBuilder append(long lng)
StringBuilder append(Object obj)
StringBuilder append(String str)

举例如下:
public static final String sample() {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < 10; i++) {
sb.append(i); sb.append(',');
}
return sb.toString();
}