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public String makeStars(int size, char ch) {
    if(size < 1) {
        throw new IllegalArgumentException("size must be greater than 0");
    }
    char[] chs = new char[size];
    for(int i = 0; i < size; i++) {
        chs[i] = ch;
    }
    return new String(ch);
}


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import java.util.HashMap; 
import java.util.Iterator; 
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import java.util.Map; 
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    /**
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package com.hd123.h5.ejb.verctrl;
public interface CallBack {
  public void callBack();
}
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String s = new String("abc");   
String s1 = "abc";   
String s2 = new String("abc");   
  
System.out.println(s == s1);   
System.out.println(s == s2);   
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