package cn.itcast.p1.string.demo;
public class StringObjectDemo {
/**
* @param args
*/
public static void main(String[] args) {
// String s1 = "abc";
// String s2 = "abc";
//intern():对字符串池进行操作的
String s1 = new String("abc");
String s2 = s1.intern();
System.out.println(s1==s2);//false
}
}
java中的String类（来自毕向东老师视频资料）(二)
em.out.println("abc".concat("kk"));
// System.out.println("abc"+"kk");
// System.out.println(String.valueOf(4)+1);
// System.out.println(""+4+1);
}
private static void stringMethodDemo_4() {
System.out.println("abc".compareTo("aqz"));
}
private static void stringMethodDemo_3() {
String s = "abc";
System.out.println(s.equals("ABC".toLowerCase()));
System.out.println(s.equalsIgnoreCase("ABC"));
System.out.println(s.contains("cc"));
String str = "ArrayDemo.java";
System.out.println(str.startsWith("Array"));
System.out.println(str.endsWith(".java"));
System.out.println(str.contains("Demo"));
}
private static void stringMethodDemo_2() {
String s = "张三,李四,王五";
String[] arr = s.split(",");
for (int i = 0; i < arr.length; i++) {
System.out.println(arr[i]);
}
char[] chs = s.toCharArray();
for (int i = 0; i < chs.length; i++) {
System.out.println(chs[i]);
}
s = "ab你";
byte[] bytes = s.getBytes();
for (int i = 0; i < bytes.length; i++) {
System.out.println(bytes[i]);
}
System.out.println("Abc".toUpperCase());
String s1 = "java";
String s2 = s1.replace('q', 'z');
System.out.println(s1==s2);//true
System.out.println("-"+" ab c ".trim()+"-");
}
private static void stringMethodDemo_1() {
String s = "abcdae";
System.out.println("length:"+s.length());//6
System.out.println("char:"+s.charAt(2));//c//StringIndexOutOfBoundsException
System.out.println("index:"+s.indexOf('k'));//0//-1 我们可以根据-1，来判断该字符或者字符串是否存在。
System.out.println("lastIndex:"+s.lastIndexOf('a'));//4
System.out.println("substring:"+s.substring(2,4));
}
}