Java 拆分String String equals 方法的实现

　　　　

 

split

package com.equal_;

import java.sql.SQLException;

public class Cast {
  public static void main(String[] args) throws SQLException{
    String s="ABCD";
    String[] ss=s.split("");
    for(String value:ss){
      System.out.print(value+"\t");
    }
  }
}

　　

iteration

package com.equal_;

import java.sql.SQLException;

public class Cast {
  public static void main(String[] args) throws SQLException{
    String s="ABCD";
    String[] ss=new String[s.length()];
    for(int i=0;i<ss.length;++i){
      ss[i]=s.charAt(i)+"";
    }
    for(String value:ss) System.out.print(value+"\t");

    char[] c=new char[s.length()];
    for(int i=0;i<c.length;++i){
      c[i]=s.charAt(i);
    }
    for(char value:c) System.out.println(value);
  }
}

　　

 

  @Override
  public boolean equals(Object obj) {
    if (this == obj) return true;
    if (obj instanceof String) {
      String str = (String) obj;
      if (str.length() == this.length()) {
        int i = 0;
        int n = this.length();
        while (n-- != 0) {
          if (str.charAt(i) != this.charAt(i)) return false;
        }
      }
    }
    return false; // obj is not String
  }