package model3.unit1;
public class Java04 {
public static void main(String[] args) {
// (4)字符串常用方法
// 长度
int a = "abcde".length();
System.out.println(a);
// 截取
String b = "abcde".substring(2);
System.out.println(b);
// 截取
String c = "abcde".substring(1, 4);
System.out.println(c);
// 去除空格
String d = " abc ".trim();
System.out.println(d);
}
}
package model3.unit1;
public class Java05 {
public static void main(String[] args) {
// 字符串常用方法
// 大写
String a = "abcDE".toUpperCase();
System.out.println(a);
// 小写
String b = "BbC".toLowerCase();
System.out.println(b);
// 不区分大小写相等
boolean c = "aBc".equals("Abc");
boolean d = "aBc".equalsIgnoreCase("Abc");
System.out.println(c);
System.out.println(d);
// 判断开头
boolean e = "abcd".startsWith("ab");
System.out.println(e);
// 判断结尾
boolean f = "abcde".endsWith("de");
System.out.println(f);
}
}
package model3.unit1;
public class Java06 {
public static void main(String[] args) {
// 字符串常用方法
// 是否包含
boolean a = "abc".contains("bc");
System.out.println(a);
// 替换
String b = "abcabcabc".replaceAll("b", "张三");
System.out.println(b);
// 判断空字符串
boolean c = "".isEmpty();
System.out.println(c);
// 字符串转换char[]
char[] d = "abcde".toCharArray();
for (char x:d) {
System.out.println(x);
}
// 分割字符串
String[] arr = "张三,李四,王五".split(",");
for (String n:arr) {
System.out.println(n);
}
}
}