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//获取字符串的长度

String str2 = "helloword";

System.out.println(str2.length());

//利用数组创建string对象

char[] cha = {'h','e','l','l','o','w','o','r','d','!'};

String str = new String(cha);

System.out.println(str);

//利用数组创建string对象的第二种姿势

char[] cha = {'h','e','l','l','o','w','o','r','d','!'};

String str = new String(cha,0,5);

System.out.println(str);

//删除字符串最后一个字符

String str3 = "HelloWord!";

str3 = str3.substring(0, str3.length()-1);

System.out.println(str3);

//获取某一位置的字符 ，charAt()方法的索引从0开始

String str4 = "HelloWord";

char s = str4.charAt(5);

System.out.println(s);

//连接两个字符串

String str5 = "Hello";

String str6 = "Word";

System.out.println(str5.concat(str6));

//去除两边空格

String str7 = " Hello ";

System.out.println(str7);

str7 = str7.trim();

System.out.println(str7);

//比较两个字符串内容equalsIgnoreCase()方法比较不区分大小写

String str8 = "Hello";

String str9 = "hello";

System.out.println(str8.equals(str9));

System.out.println(str8.equalsIgnoreCase(str9));

//大小写的转换

String stt = "hello";

stt = stt.toUpperCase();

System.out.println(stt);

String stt2 = "HELLO";

stt2 = stt2.toLowerCase();

System.out.println(stt2);

//替换字符串，replaceAll()方法会使用另一个值替换列表中出现的所有某一指定值。

String str = "Hello";

str = str.replaceAll("l", "L");

System.out.println(str);

//分割字符串

String str = "Hello,Word";

String Astr[] = str.split(",");

for (String string : Astr) {

System.out.println(string);

}