- 1:输出字符串"HelloWorld"的字符串长度
- 2:输出"HelloWorld"中"o"的位置
- 3:输出"HelloWorld"中从下标5出开始第一次出现"o"的位置
- 4:截取"HelloWorld"中的"Hello"并输出
- 5:截取"HelloWorld"中的"World"并输出
- 6:将字符串" Hello "中两边的空白去除后输出
- 7:输出"HelloWorld"中第6个字符"W"
- 8:输出"HelloWorld"是否是以"h"开头和"ld"结尾的。
- 9:将"HelloWorld"分别转换为全大写和全小写并输出。
- 10:创建一个类,有width,height和id属性,要求重写该类equals方法,使得该类对象在所有属性的值都相同的情况下才相等
package work001; public class Work003 { public static void main(String[] args) { String a = "HelloWorld"; System.out.println(a.length()); System.out.println(a.indexOf("o")); System.out.println(a.indexOf("o", 5)); System.out.println(a.substring(0,5)); System.out.println(a.substring(5)); String b = " Hello "; System.out.println(b.trim()); System.out.println(a.indexOf(5)); System.out.println(a.endsWith("ld")); System.out.println(a.startsWith("h")); System.out.println(a.toLowerCase()); System.out.println(a.toUpperCase()); System.out.println(a.equals("HelloWorld")); } } class Bwj{ private String width; private String height; private String id; public String getWidth() { return width; } public void setWidth(String width) { this.width = width; } public String getHeight() { return height; } public void setHeight(String height) { this.height = height; } public String getId() { return id; } public void setId(String id) { this.id = id; } public boolean equals(String width,String id,String height) { if(this.width.getClass()==width.getClass()) { if(this.width==width&&this.id==id&&this.height==height) { return true; } else { return false; } }else {return false;} } }