String StringBuilder StringBuffer
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String
1,final不可变的
2,重写equals方法
public boolean equals(Object anObject) { if (this == anObject) { return true; } if (anObject instanceof String) { String anotherString = (String)anObject; int n = value.length; if (n == anotherString.value.length) { char v1[] = value; char v2[] = anotherString.value; int i = 0; while (n-- != 0) { if (v1[i] != v2[i]) return false; i++; } return true; } } return false; }3,重写hashCode方法( s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1])
public int hashCode() { int h = hash; if (h == 0 && value.length > 0) { char val[] = value; for (int i = 0; i < value.length; i++) { h = 31 * h + val[i]; } hash = h; } return h; }
StringBuilder线程不安全的,主要用于方法内部(得保证在多线程环境下的安全);
StringBuffer线程安全的,主要用于全局变量。
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