杂记_Java基础

String s1="I Love Games";
Srting s2="I Love Study";
char[] a;
int b;
boolean c;

c=s1.equals(s2); //判断相等
c=s1.equalsIgnoreCase(s2); //判断相等，忽略大小写
s1=s1.toLowerCase(); //所有大写转为小写
a=s1.toCharArray(); //转为字符数组
b=s1.length(); //返回字符串的长度
s2=s1.subString(start,stop); //返回一个从start开始，以stop结束的子字符串，记第一个字符为0号

public static void main( String[ ] arguments ) 
    {
        String[] weekDays = {“Mon”, “Tue”, “Wed”, “Thu”, “Fri”};
        System.out.println( weekDays[0] );
    } 

public static void main( String[ ] arguments ) 
    {
                //.length 用法
               arguments= {"She is pretty","He is handsome"};
               for (int i = 0;i<arguments.length;i++)//arguments.length返回2
               System.out.println(argument[i]);
               //.length() 用法
               String a="Joe";
               int length=a.length();//a.length()返回3
    }

char[] d= {‘a’,‘b‘};
System.out.println(d);