substring 删除重复的字符

Question

package com.butone.db2help.ClassBean1.DeptBean;
public class DeptBean{
public String BMXXID;
}package com.butone.db2help.ClassBean1.DeptBean;
public class DeptBean{
public String BMBH;
}package com.butone.db2help.ClassBean1.DeptBean;
public class DeptBean{
public String BMMC;
}现在我想变成这个效果，package com.butone.db2help.ClassBean1.DeptBean;public class DeptBean{
public String BMXXID;
public String BMBH;
public String BMMC;
}应试怎么搞呢 ？
谢谢各位大了！！！！

Answer 1

public、String也是重复的！！只能删除相同的行（留一行）
结果是
package com.butone.db2help.ClassBean1.DeptBean; 
public class DeptBean{ 
public String BMXXID; 
}package com.butone.db2help.ClassBean1.DeptBean; 
public String BMBH; 
public String BMMC; 
} 

Answer 2

BufferedReader br = new BufferedReader(new FileReader(s));
Set<String> set = new LinkedHashSet<String>();
String line = null;
while ((line = br.readLine()) != null) {
set.add(line);
}
for (String str : set) {
if (!str
.equals("package com.butone.db2help.ClassBean1.DeptBean;".trim())
&& str
.indexOf("package com.butone.db2help.ClassBean1.DeptBean;") != -1) {
continue; }
System.out.println(str);
}

Answer 3

BufferedReader br = new BufferedReader(new FileReader(s)); 
Set <String> set = new LinkedHashSet <String>(); 
String line = null; 
while ((line = br.readLine()) != null) { 
   set.add(line); 
} 
for (String str : set) { 
   if (!str 
           .equals("package com.butone.db2help.ClassBean1.DeptBean;".trim()) 
       && str 
           .indexOf("package com.butone.db2help.ClassBean1.DeptBean;") != -1) { 
      continue;
   } 
   System.out.println(str); 
}