java字符串

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已于 2023-05-03 13:20:59 修改

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文章标签： java

于 2023-04-28 14:15:33 首次发布

本文链接：https://blog.youkuaiyun.com/qq_33525299/article/details/130424938

版权

字符串切割

String s1 = "/";
String s2 = "/1028";
String s3 = "1028";
String s4 = "/1028/1028-1";
String s5 = "";
String s6 = "/1028/1028-1/";
String[] sp1 = s1.split("/");//0
String[] sp2 = s2.split("/");//2
String[] sp3 = s3.split("/");//1 没有返回自身
String[] sp4 = s4.split("/");//3
String[] sp5 = s5.split("/");//1 没有返回自身
String[] sp6 = s6.split("/");//3
System.out.println(sp1.length);
System.out.println(sp2.length);
System.out.println(sp3.length);
System.out.println(sp4.length);
System.out.println(sp5.length);
System.out.println(sp6.length);

去除最后的,

StringBuffer role = new StringBuffer();
System.out.println(role.lastIndexOf(","));//-1
//role.deleteCharAt(role.lastIndexOf(","));//报错String index out of range: -1
//需要判空
if(StringUtils.isNotBlank(role)){
    role.deleteCharAt(role.lastIndexOf(","));
}
System.out.println(role.toString());//空串
role.append("部门经理,");
role.append("小组长,");
if(StringUtils.isNotBlank(role.toString())){
    role.deleteCharAt(role.lastIndexOf(","));
}
System.out.println(role.toString());//部门经理,小组长

去除最后的,

StringBuffer role = new StringBuffer();
//需要判空
if(StringUtils.isNotBlank(role)){
    role.deleteCharAt(role.lastIndexOf(","));
}
System.out.println(role.toString());
role.append("部门经理,");
role.append("小组长,");
if(StringUtils.isNotBlank(role.toString())){
    role.deleteCharAt(role.lastIndexOf(","));
}
System.out.println(role.toString());//部门经理,小组长