public class Demo03 {
public static void main(String[] args) {
// TODO Auto-generated method stub
char[] ch={'a','b','c','d','e'};
String str=new String(ch);
String str1=new String(ch,1,2);
System.out.println(str);
System.out.println(str1);
//字符串长度
int len=str.length();
System.out.println(len);
//截取字符串
String s1=str.substring(2);
//从起始位置街渠道结束位置(包头不包尾)
String s2=str.substring(2,3);
System.out.println(s1);
//判断开头和结尾
String strr="I Love J";
String s3="II";
String s4="J";
System.out.println(strr.startsWith(s3));
System.out.println(strr.endsWith(s4));
//判断字符串是否包含字符串
String s5="I Love J ,J is the Best";
String s6="j";
boolean f1=s5.contains(s6);
System.out.println(f1);
//indexof 如果没有改字符串则返回-1
System.out.println(s5.indexOf(s6));
//将字符串转成字节/字符数组
String s7="伟哥";
byte[] b1=s7.getBytes();
for(int i=0; i<b1.length;i++){
System.out.println(b1[i]+" ");
}
char[] c1=s7.toCharArray();
for(int i=0;i<c1.length;i++){
System.out.println(c1[i]+" ");
}
//判断字符串内容是否相同
String s8="Oracle";
String s9="Oracle";
System.out.println(s8.equals(s9));
//不考虑大小写的方法
System.out.println(s8.equalsIgnoreCase(s9));
System.out.println(s8.toString());
//将字符串转成大小写
System.out.println(s9.toUpperCase());//转大写
System.out.println(s9.toLowerCase());//转小写
}
}