public class StringBuilderAPI {
public static void main(String[] args) {
StringBuilder builder=new StringBuilder("java")
builder.append("haohao")
System.out.println(builder.toString())
builder.replace(4, 10, "heihei")
System.out.println(builder)
builder.delete(4, 10)
System.out.println(builder)
builder.insert(0, "学习")
System.out.println(builder)
builder.reverse()
System.out.println(builder)
// StringBuilder a=new StringBuilder("a")
// for(int i=0
// a.append("a")
// }
// System.out.println("添加字符完毕")
StringBuilder str=new StringBuilder()
System.out.println(str.capacity())
System.out.println(str.append('2'))
System.out.println(str.append(4))
System.out.println(str.append(9.7))
System.out.println(str.charAt(0))
}
}
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