src/ch4/PassTest.java · Wings/JavaProgramming

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JavaProgramming

src

ch4

PassTest.java

PassTest.java 382 Bytes

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tzhanggit authored 2020年03月19日 14:23 +08:00 . 修改部分代码注释

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

package ch4;

public class PassTest {
	public void changeStr(String value) { // 引用类型参数
		value = value.substring(1,3); //方法中改变形参所指对象
	}
	public static void main(String args[]) {
		String str;
		PassTest pt = new PassTest();

		str = new String("Hello");
		pt.changeStr(str); // 引用类型参数的传递
		System.out.println("Str value is: " + str); //el:1 hello:0
	}
}