学习java第37天
1.String的创建方式
*直接初始化
public class StringDemo1{
public static void main(String[] args){
String name = "帅哥";
System.out.println(name);
}
}
*通过new关键字创建
public class StringDemo1{
public static void main(String[] args){
String name = new String("帅哥");
System.out.println(name);
}
}
2.String对象通过“+”串联
public class SyringDemo2 {
public static void main(String[] args) {
String s = "abc";
s = s + 12;
System.out.println(s);
}
}
//abc12
从结果看，字符串相加还是字符串，
public class SyringDemo3 {
public static void main(String[] args) {
String s = "abc";
s = s + 1+2+s;
System.out.println(str);
}
}
//3abc
1+2并不是字符串类型，是整型，整型相加再与字符串相连，就是这个结果
3.String类的本质是字符数组char[]
public class SyringDemo3 {
public static void main(String[] args) {
char[] ch = { 北','京','欢'，'迎','你' };
char[] ch2 = { '张','三' };
char chs = copy(ch, ch2);
System.out.println(chs);
}
private static char[] copy(char[] ch, char[], ch2) {
int len = ch.length + ch2.length;
char[] chs = new char[len];
for (int i = 0; i < ch.length; i++) {
chs[i] = ch[i];
}
for (int i = 0; i < ch2.length; i++) {
chs[ch.length + i] = ch2[i];
}
return chs;
}
}
//北京欢迎你
//北京欢迎你，张三
4.明天学习内容：String池，hashCode和equals
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